Fwb caught feelings?

So I had fwb for less than 2 weeks with a friend (friend 2) while our mutual very good friend (friend 1) left for vacation. We did it in his bed every time and it was really hot, once while he was on call with us. But now friend 1 has come back and friend 2 has started acting weird. I feel like I'm acting the same as before but he's not replying to my texts and if he does it's ages after I texted (like a legit day or a big chunk of the day). And this guy is addicted to his phone, he's always on it. I feel like I'm pestering him whenever I text him and I don't know what to do. Cause he's a good friend of mine, did he stop texting me because we had sex? Did he catch feelings that he's trying to supress?I really don't know