We have been together 2.5 years and live together. Mine are 15 and 13, his DD is 4 and stays only in school hols. We have had a lot of issues with both our exes. Mine has improved, his will be a thorn in both of our sides for years to come.
Over the last few months, DP has struggled with some of my children's behvaiour regarding tidiness and respect for the house and contents. There has been room for improvement, they have accepted when they have been at fault and worked on it. DP and I have presented a united front. My DDs love him but the youngest is in a bit of a bad place at the moment, hears negativity and thinks he doesn't want her here. He adores them both, but his past relationship also involved two step children, one of whom was a difficult child and there were many rows between her and her mother, so it was not just her relationship with DP that was a problem.
DP says that he will not come between me and my children and if one/both is not happy then things cannot continue as they are. He has been working abroad a lot recently and there are many opportunities for him. He now says that he will take a job abroad, not with the intention of ending our relationship but because he thinks history is repeating itself, we will end up in a situation where we are all unhappy and he wants to avoid that.
We have pledged to spend the rest of our lives together and I feel like he is running away rather than deal with something that can be fixed. My kids are fairly normal, smart, happy teenagers who sometimes forget that we have house rules about tidiness and respect (and I'm not talking OCD levels here).
I wonder whether some sort of family therapy might help? I know that his ex is part of the problem and working abroad would also make it more difficult for her to have an impact on our family life and emotional wellbeing. It's not just bad feeling, I had to report her to the police twice last year and had her served with a harrassment warning.