Became FWB with my close friend, what should I do?

He used to be my senior back in high school, now we are both in uni and reconnected early this year.

He told me he was interested in me in February but I told him I wasn't sure. 3 weeks later I realised I actually do like him and told him that.

Then we started getting closer but we both realise we were not ready for a relationship (I just recently got out of a 3 year relationship and it was his last year of medical school and he wants to prioritise his studies) so we put it off and decided to move on. Saying if by next year we still like each other we can try it out. We had had sex at this point.

Then lockdown happened and we didn't see each other from March until 2 weeks ago. During this time I managed to move on from him

He suggested to be friends with benefits, and I agreed. Though I have never caught feelings for any of my previous fwb, this case is different because I did like him at some point.

I do like having sex with him but I can see myself thinking and wanting to talk to him more. I miss what we had before the lockdown.

When we hang out with our friends I find myself trying not to interact with him or act nonchalant, and I feel like he's doing the same thing like ignoring me around others. Though I do the same thing, I feel hurt that he does that.

I don't know if I should talk to him about my worries about my feelings coming back or I should just stop without expressing how I feel to him. At least I wish to salvage the friendship because he is a great guy but I'm scared that too cannot be the same again