Tell him, "No."

Tell him that your plans have already been made and you are going alone. Stand your ground or this will become a reoccurring theme, he will always expect your life and plans to revolve around him and his kids.

Are you going to try to climb Everest?!  That's really cool. And dangerous.

Just tell him - you want to go alone, and you are keeping the dates as planned.  Don't let him talk you out of it.

You can do better than him and his spawn.  He is not stepping up to meet your standards in a partner.  

He's a boyfriend, not a partner. Climb that mountain as you planned and let it be finished. A real partner is out there somewhere for you.

A real partner would be happy that you are achieving one of your longstanding dreams, and would not try to threaten you over it.  He would say "go and do it, and send me updates".  

He is going to end your relationship if you do not conform to his wishes by losing 900 euros, changing your already made plans, and taking the chance that the trip will be cancelled completely when his ex finds out about it?  Seriously?  Besides, is he even capable of doing the climbing?  An adventure like that is not exactly a trip to Disneyland!  This guy sounds like a complete mismatch for you.  He may have some good points but I don't see how they could outweigh the bad.

I always talked about going backpacking one day, before having kids, and my husband (then boyfriend) was entirely supportive of the idea. I say go, and if he ends things, it wasn't meant to be. He needs to accept that you're childless, and thus, have different goals and priorities than him sometimes. 

..o yea he also said if i go were finished 

If he didn't express interest in going before, he really isn't interested in going now. Change your plans now and look forward to having to change them again as something while suddenly come up that interferes with the new plans. Odds are that if you change your plans now, you will never go.

He has spoken. He has shown you who he is. Make your plans accordingly. Start looking for new living arrangements and move. You don't need his negativity while planning and preparing for this trip. 

You are about to do an amazing and dangerous thing.  You do not need any distraction or drama taking up space in your head.

Time to let DH know that this is a  you only trip.  Explain the danger and purge this from  your mind.

Enjoy your trip.

You're dead sure you are ready to be in a committed relationship, hun, with this guy in particular, or with a man in general? Sure-sure?

Ok.. I am assuming that you didn't make your plans without talking to him.. because that would be something a partner would do before planning something so big.

But, if you did and he is coming in after the fact and trying to force you to change.. with the threat of breaking it off with you?  Sorry dude.. no way.  If he does break up with you.. probably a blessing in disguise.

You climb mountains in Nepal but you gave up your job to care for someone else's children and are cowed by accusatons of cheating and someone needing to "keep an eye on you?"  I'm sorry but that does not add up.  It sounds like you lost yourself somewhere after meeting this guy and are now regretting it.  Love is great and all that but are you still you?

You don't need his permission. You are a capable, responsible adult who has LOGICALLY made the necessary work and financial arrangements to make YOUR trip. DO IT. Don't let his sour grapes stop you from embracing and living your wonderful adventure.

I have made several trips WITHOUT my DH. He didn't whine. He didn't ask me to change my plans or NOT go. He told me he'd miss me and to have a WONDERFUL TIME.

OMG, why would you give up your job to take care of someone else's family? You are being taken advantage of. Please get out of this relationship, go on your climb, get another job and take care of YOU. Please.

Go on your climb with your friends? Teammates? I am envious. DD7 and I are avid hikers and we are always looking for the next cool thing. You go do this awesome thing.

time to sit with your boyfriend and let him know he needs to step up to parenting his kids because you are going on this trip as planned and also are goi g to start looking for a job. Get yourself back and then decide where you want this relationship to go.

Good luck with your summit attempt!

Why give up a dream because your partner calls "bad timing"? It is incredibly selfish on his part! People train for weeks, months or years and often the window period for their attempt is set because of logistics and weather. Where does he get off asking you to change this? Even so, if he prepared to climb or live at a base camp? He is fit enough to do this? Or does he want a free holiday to rain on your parade?

Follow your dream and cut him loose on this trip.

He wants you to postpone a dream trip because it's inconvenient for him. He doesn't trust you. He doesn't know how he'll take care of his kids while your gone. If you take this trip, the relationship is over.

Hon, this should not be a difficult decision. If one of your girlfriends presented you with this same set of facts, what would you tell her?

Get a job. And get up the mountain. 

NO, do not change your plans for ANYONE.

While it's a plus that he's willing to go, tell him he can go with you next time because you can't afford to lose the money you spent on tickets. End of discussion.

You already know the value of travel and the trip you're planning should not wait a moment -- you need to be in top shape for it. Don't wait. DO NOT WAIT. DO NOT LET ANYONE GET IN YOUR WAY.

You have no idea what will happen to your life. If you break your leg, you may never be able to do that trip. Do it now, while you can. He will be there waiting with all his kids when you get back. If he doesn't want to wait, maybe you'll just decide to stay in Nepal. There are plenty of men, but only one Nepal.

Go for what you loved before you met him. If there's no way to have both without complications, that tells you something about the relationship.

I postponed my honeymoon in India because of my sick dog. I've been married 10 years now and I still haven't gotten there. Don't take the chance of missing out on your dream adventure.

and reality has finally hit him “oh shit!! I actually have to deal with the kids on my own for 3 weeks”, seems like he’s been chilling on the parenting front.