<human>: We're all freshmen in college in the same dorm.

So we all started college back in September, and I sort of got involved with this girl (Kelly) for the first week. It wasn't anything too serious, and after the first week it didn't really work out. Everyone in the building knew about it. It was a bit awkward between us for a bit but now we're friends.

Cut to a few months later and a bunch of us in the building are all in a big friend group, including Kelly and my good friend, Matt. A few weeks ago Matt asked me if I still had feelings for Kelly and if I would be cool with him asking her out. I assured him that there wasn't anything between us and that I wouldn't care if he asked her out. So he did and now they've been 'officially' dating for the past 2 weeks.

The problem is that Matt seems to be a bit concerned that there may still be something between me and Kelly. Our friend group is pretty close and we do stuff together a lot, and whenever me and her are talking he inserts himself into our conversations and get's kind of 'attached' to her whenever I'm around. A few of my other friends have noticed this as well, and one even brought it to my attention and asked me what was going on because she thought it was so noticeable. For context, he only does this when Kelly and I are talking/in the same room, even if there are others around.

How do I assure him that I'm no longer interested in Kelly, because I don't want to lose a good friend over something as trivial as this.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: My friend is dating a girl that I was involved with for a few days and is concerned that there may still be something between us. How do I assure him that there isn't?