Relationship advise

Honestly i dont know who to ask for relationship advise.

What should i do!? So im 22 and this is my first relation ship. I los my virginity to him We both have our phones locked but we know each others passwords. I was going to leave him a message on his phone but the messages were open so i tried to back up he has an i phone and its confusing to me lol anyways i backed up and clicked on the messages under mine like the next on and then i saw something i wish i had never seen it. There were like nudes and his dick pic on there. And she asked him why did he hang up and what not they were like sexting and video calling or something. I mean it shattered me i don't know what to do. I feel really hurt you know. I confronted him and he apologized and i didnt forgive him like nothing i mean he cried and everything because he didnt want me to end the relationship. I dont know im just like upset and it hurts like hes said that hes never had actual physical contact with anyone else. But i dont know im mad at him but at the same time i forgive him. Like i dont know it makes me feel like im not enough and my confidence level just dropped i feel more disappointed in myself then in him