Why does he act like this when he has a fiancé?

Anonymous
My coworker likes to joke a lot and he’s about 10 years older than me and he thought I was younger like 19 but I’m really 22. We were talking about personalities with my two other girlfriends from work and he said I was sweet. And he said there’s different kinds of nice people where it means you’re nice but not that attractive and then other kinds and then I asked which one I was and he said I was bubbly and had a really nice personality and emphasized that I had a nice personality. Then he said I’m really the first one. I visibly got offended and said “did you mean the unattractive one? I’m not ugly, I’m pretty” and he laughed and my coworkers got silent and awkward and one said “you are” but it was awkward. They stayed quiet and were eventually like “he’s just messing with you. You’re reaction is funny, that’s why”. He clarified eventually and was like “you’re bubbly and have a nice personality”. but then after some awkwardness he said I was actually very attractive and said it seriously and walked away. It did sound believable when he called me attractive. I know I’m not ugly because a lot of people have called me pretty or beautiful without question and I don’t think I am but why did he bring up my looks? Lol. I asked my two friend coworkers and one of them said he was obsessed with me and only does that for me and they both said he’s obsessed with doing it because he likes to get a reaction out of me. Why did he say this though? Lol. I don't know if was he just using an excuse to call me attractive. The thing is though, he has a fiancé. He hasn’t told me about his proposal but told my two other coworkers ( the ones who think he’s obsessed with me and my reaction ). Today I tried teasing him today jokingly and told him he should leave and he jokingly got offended and blushed and then came to my coworker and told her about his engagement pics while I was next to her, which I thought was weird because he had all day to tell my coworker? Why does he act like this?
Why does he act like this when he has a fiancé?
3 Opinion