Second chance for ex?

so my ex and I dated for about 6 months, (we're 19/20)we were friends for a while before that. everything was great, there were never any red flags and he always treated me right, even looking back now after some time.

In august he told me that a week before he went onto an online site to talk to a girl to basically jerk off. I didn't find this out, he just decided to admit it to me. He told me he understood that he disrespected me and that it was beyond immature and he regretted it, which is why he told me. and we talked for a while about it, he was very remorseful. Of course I let him go though, I just felt so so betrayed. He gave me my space and left me alone even though he told me he doesn't want anybody else.

I moved to NY for school, and for the past few weeks we kind of interacted a bit on social media, I think both trying to get the others attention.

The other day he drove 3 hours to me, and told me that he wanted to talk to me about everything. He told me again how sorry he was and that he saw a future with me and that he still does, and that I'm the only one for him and only person he's saw a future with.

To me he seems very genuine, and on top of that he was always so good to me. He told me he never cheated in person or flirted with others, it was only the online thing that one time and he knew it was a mistake.

My question was, would it be stupid to give him a chance and try again? I've tried to move on but he's genuinely the only person I've ever felt right with. He truly hurt me and I'll always know that but part of me wants to at least try. just looking for advice :/