guy troubles

So I work with this guy, we had been fwb for about 4 weeks. The sex was so good and I did just like spending time with him, but I wasn't really developing feelings with him. Until a few days ago, we hadn't had sex for a week or so and he seemed really distant so I talked to him asking What's up and he acted like a dick. Saying that it's too much for him cause we work together. I got really annoyed because I knew that wasn't the real reason.

Anyway I started feeling upset about it rather than annoyed.

So I messaged him, and we talked it out.... turns out he heard a rumour that I had been flirting with another guy from work, and he was pissed that I was then asking when he was free after supposedly "flirting" with this guy.

I told him that was not the case at all! And we talked it out. We are talking now, like he texted me saying good morning and wishing me to have a good day which when we were fucking he never did.

The only thing now is that I'm starting to develop real feelings for him and idk if I should pursue them or move on.....