Why he started to act so cold?

Hello, I have a question. There’s a man I had a crush on for a long time. I know he has got a girlfriend and I don’t want to ruin his relationship if it works, but of course it hurt me a bit when my friend told me he’s taken. I played it cool anyways. I asked him about her and told him it’s such a bad luck he’s not single, but I would still like to be friends. Then we kept having those nice conversations. We had a really great relationship, we texted each other a lot and he was very nice to me. A month ago I just asked about his girlfriend name in a friendly conversation, but of course I didn’t contact her or something, but when I saw a photo of them kissing on Insta, it hurt my heart so much that I stopped talking to him for a few weeks just to heal my heart a bit. It’s not that I stopped responding, I just didn’t initiate contact. Now I need his help with some project, so I mesagged him again and he’s like a new person. He promised he’ll help me, but the way he chats is so different. He used to send a lot of emojis and ask many question, now he just responds without any sign of emotion. Do you think I messed up something, or was he just in a bad mood? He was such a nice friend and it made me sad that he acts so weird now.

Why he started to act so cold?
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