I'm 48 and he is 51, I have no kids and he does have 2 dayghter.One is 15 and 18.We have been together for 5 years, he asked to marry him and I don't  think I should.His kids are apathetic and comes and goes, he is always sad and depressed because of them.His mother passed and they didn't called him.They we're back in his life  few weeks a go.Now they are gone again.No calls no text , nothing! And again he is broken.I can't stand them, they told him that they like me and he did Believed him.Im exausted, he definitely has the Guilt father syndrome.I feel bad for all the excuses he makes for them.I don't know how I can be married to him when I can stand his daughters .I need to get away from them, but is not easy .I tried to have a relationship with them, but this kids are not warm they just don't care about anything.