Why does he keep doing it if he’s going to regret it?

Anonymous
So I have been sleeping with a guy I genuinely like who I believe is using me for sex. I don’t hear from him much but when he wants sex he is consistent and putting in unbelievable effort. I fall for it and sleep with him. Every time after it he feels sad guilty like he regrets for whatever reason. Only for like two or three weeks later he is messaging me consistently with his effort asking me things like am I on my period. Which is what he is doing now.
Why does he keep doing it if he’s going to regret it?
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