Why is it so awkward between us?

I arrived on a job a few months ago. The first week, we had a seminar with all the employees. From across the room, I noticed someone was watching me, a beautiful man. I thought « at least one cute guy here ». At lunchtime, I sat and he was at the same table. I tried to talk to everyone so they could know who I was. I asked him a question. He looked at me with smiling eyes, answered and turned his head right away, he was uncomfortable. It kind of felt like a slap on my face so I stopped talking to him. Then he talked to everyone but me, it felt rude. A few weeks later, I land on a project, we started working together without much interaction. We had to finish a task so I did my best to send it on time before his vacation, no thank you nothing ! Rude again. I felt like he was limiting his interactions with me. Few weeks later, he invited me for a Zoom call just him and I, I decided to limit our interactions once I arrived I didn’t ask how he was, just said hi and made sure the meeting was only 15 minutes instead of 1 hour. A few weeks later, I asked him to do something for our project I went to its office to explain it, he said Ok but no news afterward (a signed document). One week later, I send him a message but no answer. The day after, I sent him a message asking if he had done it, he promised to do it. The same day we received a mail from the client who was unhappy because he didn’t have the document, I got mad and said to my colleague that I was gonna be in trouble, he laughed which made me more mad. Then, he sent the doc without putting me in cc. Then on Monday, I learned that he had planned a meeting for the project without me. I sent him a message and asked if he had a problem with me. He said « not at all » and sent me the invitation. The day of this meeting, it was awkward, I arrived and he had a smile on his face, he was trying to be nice, the problem is that I just couldn’t look at him. It was tensed and so was he. There might be attraction involved.

Why is it so awkward between us?
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