Need advice

So, I’ve been with my boyfriend for a year and a half and I order to get the best idea of me situation I have to give a short backstory.

So basically Im not on good terms with my immediate family as in they only saw me as their piggy bank (and when I asked why I had to give so much they immediately called me a disrespectful ungrateful selfish prick)

So I ended up leaving from the bs and was living in my car for about 3 days.. my bf (were dating for 3/4 months already) found out and he and his mom told me to live with them.. we did that for 4 months and ended up getting an apartments together... while living together I see that he’s flirting with other girls on snap and we talked, he apologized and promised to not to do it again. Ends up doing it again, he apologizes. At this point we’re stuck in a lease together and his moms house is already too full. So I let him sleep in the living room and eventually we make up. I recently found out that he slept with someone else a year ago right before I moved in with them... (keep in mind we told each other we were going to be official and committed 1 month after dating) he told me that was the only person and I decided to forgive him since it was a long time ago and there’s nothing I can do about me sleeping with him countless times and not knowing... just a week ago I found out he actually cheated on me a time before that and when I asked him before if there was anyone else he told me no... so basically he’s the type to not admit to anything until you have hard proof/evidence... idk if I should continue this relationship or not..