Feeling Hopeless, anger

My BD and I bought a house together back in August. We did it for leverage and so my son could grow up in a decent neighborhood. However we knowingly went into it about our complex issues. I just learned last night that he is ONLY doing it for our son and isn't really interested in the family dynamic. Lately, I've been having a lot of breakdowns and anger flare-ups. I work from home AND take care of my 3 almost 4yo son. He is at an age where it's been extremely hard to handle. He destroys the house while I'm working, constantly talks, makes repetitive noises and asks me questions throughout my work shift. I also handle everything else through the week; laundry, cleaning up mounds of toys and keeping the house clean, dishes, education and park times, most bath times, you name it! I've gotten extremely angry at how my BD nags for sex a lot (last thing on my mind) but then can't take a moment to have a conversation with me about things that are on my mind. Everything gets pushed under the rug then I end up exploding! He recently learned big info regarding his job and he doesn't even share it with me. I started not sharing stuff with him to see if he noticed but nothing! He also tends to ruin EVERY holiday and I believe it's intentional bc I avoid his family (they've said a few unkind/degrading things to me and he thinks I'm too sensitive). I always want to talk about these topics but I'm usually met with "you're too sensitive " " you're the most angry person I've ever met" pr some criticism about my parenting or personality. Last night I exploded. Yelling and screaming. I'm sick of not feeling validated. His comment today about my work/child care situation was telling me I don't have it so bad and that the anger isn't justified at all 😡 I honestly don't think I would be that angry if i could just have a normal conversation, consistent help, be able to share about my day with support. I feel overwhelmed, used for sex, lack of emotional support. But everything turn back around being MY fault 😢