When I ask about the relationship for you, I can see that there have been issues recently, and you have been doing all you can to keep the peace, especially with his children.  There seems to have been a lot of very disruptive influences/events on his side of things recently, and given your immediate outcome, I feel as though he’s either going through a divorce, or he is in the middle of a custody battle of some kind?

I understand why you’re worried, but I can also see that he is happy with you, and that he wants to be with you. The arguments you’re having are a result of the stress he’s under and the difficulty of the situation you’re both having to navigate. You are having to work through a lot of challenging things very early on in this relationship, and that’s never an easy thing, but it doesn’t have to mean that you’re destined to fail. These experiences can bring you closer, and I feel it is his intention to keep things under control enough for long enough so that you can all weather this storm together.  

The problem that I see on his side of things is that he’s trying to keep everyone happy and that his children really are one of his top priorities, so he may be compromising too much, in an attempt to keep his ex partner (their Mother) happy, and this feels like a big part of what causes the tension you’re dealing with. He will have to learn to set better boundaries but I do believe this will follow once the legalities are sorted. 

He loves you, deeply, more than he’s able to show right now. The man you’re seeing now is who he is under extreme stress. He’s been doing his best to shield you and your relationship, but it’s clearly been bleeding over despite his efforts. Try focusing on positive ways to communicate, and to find ways to ensure your relationship remains a priority while he finalizes the divorce/custody situation.