Why do guys become distant after you sleep with them?

In this situation, he was a very very close friend who I have known for over 15 years. He was the best friend I’ve got, I told him everything and anything. We spoke daily, for years. Nothing has ever happened before sexually due to us always being in relationship with other people at separate time. For a few years I’d be in a relationship, then when I become single he’s in a relationship and so fourth. But we’ve always maintained a very close friendship throughout it all. This year was the first year we became single around the same time, and things really began to switch up with us from friends to something more. We spoke a lot of the sexual chemistry, and although I pushed for it to happen it was him to didn’t allow it. He always thought that sex would ruin what we had, and that what we had was worth more than sex. Anyway, a few months we slept together, it was amazing, very passionate and loving. I sensed he instantly regretted it but tried to hide that fact. He messaged as normal the following day and that was pretty much the last of the normality from him. Since then, and it’s been weeks it’s been me initiating conversation. He barely replies or if he does it’s days later, very brief and very blunt. We met once last weekend when I asked him to join me out, it wasn’t overly great, we didn’t speak much and he seemed to try and avoid me then spend time with me. Another week has passed with no contact, and I’m utterly heart broken. This is everything he said he would never do to me, I’ve expressed I’m hurt, and I was angry, but he lacked care and compassion. He feels he’s done no wrong, but just becus he’s not calling me names doesn’t mean he’s being nice, he’s been so cold since and I just feel as though I didn’t even know him atall. I never would have guessed he’d treat me like this, never, and that’s what hurts. It hurts so bad, and I miss him so much, but the more I try and contact and the nicer I am the more he gets further away. I haven’t messaged since Monda

Why do guys become distant after you sleep with them?
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