Hey hun, soz 2 hear bout ur situation.
Deep down wot do u really want? Would u really wana get back wiv sum1 thats treated u like that n will prob never change?
I only say this as i was in similiar situation. I had bin wiv my ex for 3 years. wen lo was 3 months old, i found out he had bin making comments on facebook 2 women that had pics of themselves in underwear. i went mad n 4gave him 4 that. but another week or so later i was still suspicious n managed to guess his password 2 facebook n found that he had bin flirtin n chattin up a school friend n asking her 2 send pics of herself 2 him!
I finished it straite away n 3 n half months on, i am so glad n happy i made the rite choice! I would have never trusted him agen. He still sees the lo every week but i see him n i jus no that i dont wana b wiv him.
I think u would b better off moving on n being happy wiv ur lo n although its hard to hear that, only u can make the decision hun.
I hope ive bin of some help, sorry i cant b more helpful, but it wil make u a stronger person goin it alone honestly. take care, hope u sort it all out xxx