Second chance?

Hi girls!! So basically i became a thing with a guy from my college in March, we weren’t considered “serious” because we weren’t bf and gf. He was leaving for his home state in May so that gave us 2 months to be together and he did tell me he wasn’t ready for a relationship (he’s only had one girlfriend and they broke up in January). Back story on him is he is a phenomenal guy. He has a huge heart and is damn near perfect. He finally asked me to be his girlfriend August July 21st. I of course said yes!! Shortly after, i found out he has been lying to me about his ex. She has depression and reaches out to him a bit when she’s down, and he hung out with her a few times over summer (without telling me). Turns out he saw her the morning he asked me to be his gf !! He told me that he was telling her they are done for good and that he’s going to move forward with me which is why he asked me later that day to be his gf. He admitted that she got real emotional and cried and they made out before he left.

I was devastated and felt like he cheated on me because for all of summer i was so loyal to him. The only thing that is keeping me some what calm is the fact that he respected me enough to wait to ask me to be his gf until he knew their history was forsure gone. He reassures me every single day, buys me flowers, holds me, and everything a worried girl could ask for! I know he would NEVER hurt me again. I just don’t know how to forsure let this go. It’s getting a little easier but i still think about it a lot. He’s a great guy:/