Why is he so awkward after hooking up? Does he feel guilty, or is he a jerk? Did sex ruin everything?

Anonymous
So the story goes like this...

A younger guy at my job began playfully teasing me, & acting kinda flirtatious. I suspected that he may have a slight crush on me, & honestly liked the attention, but I never took it too seriously.

One day he halfheartedly invited me out for after work drinks, along with some coworkers, & I went. He seemed excited that I came, & we had a lot of fun. That night the two of us ended up in a hot+heavy make out session, to both of our surprise. He admitted that he had secretly wanted to, & was worried that I would end up blaming it on the alcohol. I assured him that the attraction was mutual, but made it clear that I didn't want coworkers to know. He asked if we could meet again to finish what we started, & I didn't oppose. He was super affectionate that night, & snuck another kiss before we went home.

A couple of weeks went by with us being back to normal at work. He would, however, send me flirty texts & messages online. I also found out he had some pics, & videos, of me (not creepy or dirty) on his phone. Plus he didn't tell anyone, which made me feel more comfortable about the situation. It was cute.

After playing it cool, he just blatantly asked when we could hook up. We coordinated our busy schedules, & finally came up with a night. I ended up going to his house, where we hung out, drank a little too much, & had sex like we planned. Everything was fine that night, & the sex was OK (I think). Still, It didn't get weird until the morning.

I know me sleeping over wasn't an issue, because he already made it clear that I could spend the night, but he did have to go to work (I didn't). We left his place, barely mentioning anything about the night before, & he seemed to be in a bad mood. He then casually mentions missing some girl's daily morning text message, so she thought something was wrong. He never mentioned this girl, who lives out of town, before so I didn't know how to respond. He then joked about telling everyone at work, & gave me a quick awkward hug when he left.

I sent him a playful text saying that I hoped he made it in on time, and he did not respond.

The next time we were at work together he seemed to be ignoring/avoiding me. He was polite, & professional, but all the playfulness was gone. It bothered me so I sent him a message asking about the awkwardness. He assured me that he didn't feel awkward, he was just in a bad mood, & he was sorry if he made me feel that way. I felt better with his response, but it's been almost 2 weeks, & he is still pretty distant. We always got along, & I was starting to consider him a friend before all of this. I had no hopes of anything serious, maybe a possible friends with benefits situation, but It's not like I thought we would seriously date. Now I just want to be like it was before, but this situation has become super awkward. Is this his way of dropping me after a hook up, or am I reading too much into this? I do overanalyze everything, so am I overreacting? Why is it weird?
Why is he so awkward after hooking up? Does he feel guilty, or is he a jerk? Did sex ruin everything?
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