I think I used my best friend as a rebound and I don't know how to tell him?

So I had a pretty traumatizing incident last year in May (I was locked up in a room and beaten up by a bunch of strangers and then I was about to getting kicked out of college; it was my first year tho I held my ground and decided to stay and powered through it).

I had a best friend who was the only person other than my family who stood by me all that time and then we started talking about how we were attracted towards each other and in January this year I don't know y but we started 'dating' per say.

Problems started when he stopped putting in efforts after I said I'm uncomfortable with touching (tho coincidentally we also had exams that week so can't blame him.. ig). He also kind of accidentally hurt me multiple times while playfully 'flirting'.

The thing is I feel we both love each other platonically but we're not good as a couple... and I feel bad that I used him to try and get over that incident.
I think I used my best friend as a rebound and I don't know how to tell him?
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