Trust after cheating...

So I'll never know if my fiancé physically cheated on me, but I do know that he emotionally cheated on me and sent sexts with his ex girlfriend. Idk to what extent because I'm sure he had periodically erased messages. He did this while I was pregnant. I forgave him if you can even call it that because I still get very angry about it sometimes and I still don't trust him....has anyone been through this and been able to rebuild the trust? If so what happened how was it rebuilt...I just need to know it's possible to move forward, if other women have...thanks