Very depressed

Lately I find my self crying even more I guess I started when I got pregnant again it wasn't sopose to happen this fast my first son is just 1! I have a great boyfriend he takes care of me I pay for nothing not one bill and out of he nine years I never have! He is such a good dad we are very equal in taking care of are son he even wakes up on work nights to help me . But he is deeply flawed when I was 3 months pregnant a girl reached out to me that they have been talking and showed me all the msg I slowly started to c who he really was at that moment. I'm 7 months with are second son and he's off talking to girls on social media and talks about how fine girls are in my face when he spots them I'm so not into any sex right now due to my pregnancy and I told him I didn't care any more if he talked to other girls I was to tired to care and it hurts to no he's ok with that even tho I do care I'm just kinda giving up . We also started with are new when we had are first son we finally moved out of his house with his mom and bros an sis that he took care of forever and he moved them all back in with us for financial reasons and they have destroyed my house completely they took over so me my son and bf stay in 1 room together I'm miserable I cry everyday never in his face but cry a lot I even pee on my self because they are rude and take forever in the restroom and I'm pregnant!! On top of that I'm struggling with my pregnancy I haven't bought nothing for this baby I can't even think about him with out crying I feel bad that I'm not happy to meet him all the stuff people have gave me I put it away in box all his sonogram I can't look at them with out feeling guilty me and my first son has such a bond I feel like I'm betraying him he is a real momma boy I keep trying to talk tom bf about feeling sad or something but he changes the subject he dose not believe in depression and he loves living with his family I feel like it's killing me inside I feel I'm last to him and his family treats him like shit even his own mom who tries to always tell me how to ride my son an she did a horrible job raising hers I hate her I hate her and I'm such a nice person I hate how she uses everybody I hate how she tells me what to do and he lets her he lets her do whatever he lets his sister do whatever I don't have no where else to go so I have to deal with it I stay so quite I never say a word and I won't I no there not worth it but if he loved my y won't he help me out y can't I matter to him I want him to show me but he won't and I'm stuck and sad I don't no how to tell anyone I'm scared to I'm scared to tell my mom my dr or a friend I can't bare to tell someone i know any advice