Why guys don’t contact after sex and how to deal with this situation?

I met this guy through online and we started dating for two months but we talked about it and decided we should just be friends. Then we continued to meet up as friends for about another 5 months. It was pretty wholesome and we got to know each other better. We kinda text almost everyday and would go to workout together once a week and follow with lunch and hangout (we didn’t do anything cross the line of friendship) However, one night we were just chilling at his place, we were abit tipsy and then that led to the first hookup. The morning after, we still went to workout together. When we said goodbye I sensed that he became abit distant. It’s already been 1.5 days and haven’t heard from him and I left my stuff at his place … not sure how to react it and what to do with this situation.

Why guys don’t contact after sex and how to deal with this situation?
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