Should I forget him

So I was talking to this guy for 2 months and I have in and had sex with him. We had sex today's in a row and the. He just stopped talking to me. He told me everything j wanted to hear. He told me that he cares for me that he just wants to wrap his arms around me and never let me go that I could make him live again that I could be the best girl he ever dated that he would put me first but after having sex with him he just stopped talking to me I waited for two days and then texted him and he didn't say much I asked him to talk and he said he was busy I still care a lot about him and wondering if I should ask him what happened and what went wrong. (It's been a month since we last talked)