Should i keep fighting or walkk away?

I met the mother of my child(children3 1/2 going on 4 years ago) the attraction was mutual and almost instant she had 3 girls at the time trucc (kevin) an apartmentt in sacramento and goals not to mention thicc as hell and beautiful i had a gf at the time but i couldn't resist her... She was brutally honest from the beginning we had a bit of a rough start but it made me respect her and began to grow to fall in love... My sister has been the catalyst (the intitiator) to majority of our problems... Not to mention i came with baggage my self at the time my girlfriend from texas lied about carrying my first child and of course i fell for it an attempt to mend a relationship that was being salvaged by a lie... Major distraction but she helped me thru it outside influence from my family and her family and not being ready to fully invest all of her love in me due to our youngest daughter real father we broke up i moved to natomas but something kept us wanting to be around each other we continued to be intimate hang out but sround that time i got caught flippin the lil light skin bitch my sisters sister friend i was gonna go bak to texas and boom we found out she was pregnant i cancelled the flight first time we got bak together but the drama or the seed plaanted by my sister grew and grew i Was forced to chose i picced my fiance( i promised to marry her and take care of us when i wasnt capable of doing so or so i thought) a rumor surfaced about the of conception of  my son that i wasnt the dad so instead of being adult about the situation and talking things through i went to la with my sisters friend we lost our apartment i fuked off money all because i was scared of failure not knowing that was part of the reason why failed made the worst mistake ever cheated on her while she was pregnant and asleep with a female in the next room at the time i was drinking doing drugs to make barely making it sucess in my eyes that entire situation caused her to become a woman ive never seen before defensive unable to love trust and she got even revenge cheating and then some but we made a decison that we start fresh am i wrong for being upset with her for cheating on me but not just sex a secret relationship and claims they are in love and this year i havent slept with anyone.??