Wendy is absolutely right. LW, FWB only works if you’re ok with casual sex. I’ve been in both situations:FWB with zero problems because we both just liked having sex w/ one another but knew that’s all it was. And the FWB where he felt like a boyfriend and it took a lot of therapy to unpack that.
This is telling: “We didn’t see each other or do anything for the whole month and then last Sunday I texted him, he came over and we had sex just like the first day. He was looking into my eyes kissing me.”
Just from that sentence alone, it was easy to see you either have more than FWB feelings or on the verge of them.
You didn’t do anything wrong. He didn’t do anything wrong.
This is a good learning experience, especially understanding what you’re comfortable with intimacy-wise. He was honest and respectful of your feelings. Not all people will be.