<human>: Can you provide a brief rundown of the text in within 3 sentences?

My ex-girlfriend broke up with me a little over a month ago. Reasons for the breakup aren't that important, I think. Let's just say I understand her reasoning and whilst I regret what has happened, I realize there's nothing I can do.

Anyway, I met this 18yr old girl two weeks after the relationship ended and we started hanging out together, going on dates, et cetera. Fast forward to yesterday, when we had sex. She has never had a relationship, no boyfriends/girlfriends whatsoever. Obviously, she lost her virginity to me.

Cue the problems; I am not sure about what I want with this girl. I mean, she makes me laugh and I enjoy spending time with her. We have nice long chats and that's all fine. But for some reason, I don't feel a connection. I feel like an asshole, to be honest. She lost her virginity to me, which I guess is supposed to be special. And I didn't intend to use her for sex. It is just that I realize at this very moment that I'm not over my ex-girlfriend yet. A day after we had sex, I miss my ex and I don't know why.

What do I do? Do I tell her that I'm not over my ex-girlfriend yet? I'm afraid I'll mentally scar her for the rest of her life. I'm not proud of what I did, I genuinely feel horrible.
<bot>: Ex broke up with me a month ago, met a new girl two weeks in, had sex, she lost her virginity to me and I just realized I'm not over my ex-girlfriend yet. What do I do?