What’s wrong with me?!?!?!

I just can not for the life of me figure out what’s so wrong with me? My S/O has been around for 15 yrs we have 3 kids together he has 7 mine are the oldest and youngest so yes he cheated and had 4 kids over the yrs I’m just finding out about the last kid 3 yrs ago. While I was pregnant he was sexting my so called friend of 8 yrs was sexting plenty more females on Facebook messenger and things were just bad bad I left him and moved to a different state for almost 2 yrs whole time he selling me a dream about how he wants his family back he loves me he gonna do better he gonna show me this and that well I moved back 4months ago and nothin has changed hes worse now than he was before now he talks to me like crap with no hesitation he treats me like I’m nothing went thru his phone he still been doin the same ole thing and still sexting my “friend” amongst other females and he does not want to have sex with me anymore in the last 2 months we’ve had sex maybe 3 times I’m soooooo hurt once again I’m just kickin myself for fallin for this bs again he does not give a rats ass about me now and idk what’s wrong with me y would I even want somebody like that but it’s killing me to leave him alone I love him so much and don’t get me wrong I’m definitely not perfect I’ve screwed up n the past also but everything he tries to bring up is stuff I did over 6 yrs ago if he wasn’t pass that why play with and waste my life now I’m old fat depressed wasting away and watching my life past me by. I don’t know what to doh