Why did he try to ghost me after agreeing friends with benefits relationship?

I dated a boy before and he ran away from me after I talked about serious relationship. But I got too attached to him and I asked for friends with benefits just to close with him. Besides , I am a virgin and I am willingly to lose my virginity to him. At first he accepted that and he would be ok with that but now he is trying to ghost me like he didn’t even reply my message. Why?
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He wants to start with goving head
Why did he try to ghost me after agreeing friends with benefits relationship?
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