Why is he ignoring me?

I (17F) went to my crush's house a few days ago. We have been snapping back and fourth and made some small talk. This was my 3rd time meeting him. After some talking and awkward silence he started making out with me. He eventually asked if I wanted to have sex but I said no. We continued to make out tho. During and after we made out he said he felt guilty about it, as if he had taking advantage of me, but I kept insisting it was fine (because I DID like it). Now, he doesn't snap me as often at all, but his snap score keeps going up. He used to snap me within 3 minutes, but now it can take him hours to snap me. If I write to him but don't send anything, he does send a snap within a minute though. Is it me or is it him? Is he ignoring because he isn't interested/just wanted to get laid, or could he possibly still be embarrassed about that day?
Why is he ignoring me?
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