Hormones?

I had my DS a month ago. Since I've had him the way I feel about my boyfriend has changed. I can't explain why but I don't trust him around my son, we fight constantly about the fact that I don't make time for him and/or my son's father, and the fact I feel like he's smothering me.

When I was still in my first trimester, the father of my child cheated on me and I left. We had a horrible relationship during my pregnancy but since our son has been born we are friends and civil. My boyfriend doesn't like that. He was hoping his father wouldn't be involved and now that he is, it makes him mad.

I've felt all this since the week my son was born and i was hoping it was hormonal and would go away but it has not. I finally told my boyfriend how I felt tonight and it quickly turned into a "pity party" on his end.

Is this just my hormones or is this something that I need to take care of? My son is my number one focus and he says he understands that but he doesn't act like he does. I never wanted to break up with him especially since he was there for me my whole pregnancy and stepped up when he didn't need to but I can't force myself to feel different, right?