Devastated

My BF had some strange phone habits so finally one morning while he was sleep I checked his phone. There were so many messages and pictures with women it has totally broken my heart. I've been throwing up the past two days since I've found out - can't keep food down I'm so sick over this. He was supposed to be moving in today... We had plans of marriage and family I just can't deal. He had cried and apologized ava begged for a second chance. He says he knew he was wrong  and was already planning on cleaning up his act on his own before i caught him. I could forgive him but i don't see how i could trust anything anymore. I'm crushed right now and i just want to know had any  other woman gone thru this and it still worked out? How do you know when he's really sorry and means it when he says he won't let it happen agAin...