Why is this guy hardly talking to me?

We met through mutual friends. He acted interested. A few weeks later, I saw on tinder (premium) that he had put a like to my profile, I matched him and we briefly chatted, he said he would have like to get to know me better but he unmatched me the same evening. We saw each other again at the same friends a few weeks later, he joked about the tinder thing, was quite flirty (long gazes, giggles etc) and he told me he would have liked us to go out for a drink once. So a few days later I wrote to him I also would have loved to go for a drink and proposed a date. He did not reply. I saw him again at friends a couple months later. He apologized for never having replied and said he would really have liked to go out for a drink with me, at which I said ok next Tuesday after work and he said it was good for him. On that Tuesday night he wrote to say he had too much to do at work and wouldn’t have made it. After that we didn’t speak or see each other in a long time. I saw him again at a dinner at friends lately and he hardly spoke to me, he barely said hi at the beginning and answered grumpily the 1-2 times I tried to say something to him.

Why is this guy hardly talking to me?
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