There's a guy that I work with. He and I are both in our early twenties, and we go to the same school, but we met through work. He's always been really nice to me, and we follow each other on Instagram. I'm even on his close friends list.

My birthday is coming up, and I invited him to come. He says he's not sure if he'll be able to but he'll let me know. The next day when we worked together, he was acting a bit distant. When it came to professional stuff, he was fine talking to me. There was another coworker with us that day, and he was joking around with her way more. We work in a restaurant, and we have to check two windows to see if any food is ready. One time when he was put in my station, he kept checking the other window whenever I would come. I kind of got the feeling that he was avoiding me. It was slow, and he could've just been checking to see if there was anything on the other side, so I tried giving him the benefit of the doubt. Towards the end of my shift, he came up to me giggling about a joke that our other coworker told me. I told him a joke, and I admit, it was kind of a bad joke, and he didn't laugh or say anything. He just walked away to do some work.

A few minutes later, he asked me to find one of the managers to help him with something. I did, and I told him that the manager would come in a minute. He said thank you, but it was in passing. So he repeated himself, saying "\_\_\_\_, thank you". Like he really wanted me to know how appreciative he was.

The next time we worked together, he came right up to me and asked me how I was. That's not a weird question, of course, but he never starts conversations off like that. He is always joking around, and he just seemed a lot more formal this time. When I was finishing off my shift, he told me that he wasn't going to be able to make it for the party, but that he'll get me a gift and he wished me happy birthday.

Am I overthinking things? Maybe I misinterpreted things he did as avoidance and rudeness. Or was he being rude and felt bad?