What is he playing and what should I do?

Anonymous
So I've been friends with this one boy for 7 years now. (He's eighteen, I'm twenty-three) We met because of church and ever since then his family and my family have been really close hence why him and I became friends. We are part of the same friend group and we see eachother pretty often, whether it's holidays, church, or going out with friends. Anyway, I'd say over the past 2 years him and I got pretty close and we formed a very close friendship. Honestly, like a older sister younger brother relationship. He'd come to me for advice about girls and I'd do my best to help. And we'd bicker at eachother like siblings do.
About a month ago we were talking, and I asked him why he would always get mad if I talked about finding a guy attractive. He said "its cause I can't imagine you with another guy, hugging, kissing, or having sex with another guy." He then said that he liked me enough to get jealous. Later in the conversation he said that he didn't like me that he just wanted to have sex with me. I said no. Later in the night he texted me saying that he thought about it and that he thinks he like me. The next time we saw eqchother he acted like nothing. Then when we went out with the friend group he said that he like me, then acted cold. He did this about 3 times. The last time he brought it up he said he'd do anything to prove that he was serious about me. After that time i told him that for the sake of the friendship we should never talk about that topic again which he said "I agree". Its been about 2 weeks since and although we are acting like nothing ever happened I still feel awkward and I think I was hurt by what he did. It just felt like he never really even considered how is actions affected me. The only reason why I don't caught him off is because I don't want things to be awkward between the friend group and because I don't want our parents to notice and then ask questions. I don't know what to do. Thanks for reading :).
What is he playing and what should I do?
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