Crushing on a coworker gone wrong

I’ve been working at my job for about one year. A new coworker started a couple months ago and I like instantly made him my favorite person because he understood my humor and he was very sweet. I flipped on him about a week ago because he told me his two best friends were girls, and he had previously ask both on a date. They rejected him but he still wanted to be friends. I know I’m just being insecure and everything, but I already flipped and after I did that he blocked my number. His birthday is today and all throughout this week at work I have him the presents I had already ordered. He said thanks, but that’s really it. I was hurt he didn’t really appreciate the effort and money and time I put into the gifts. I still liked him though. Last night after taking my sleep medication I messaged him on Instagram about how badly I wanted to… with him. He rejected me and blocked my Instagram account. I am really embarrassed and I have to see him on Monday and I’m just thinking about quitting because it doesn’t feel like it’s worth it. Any advice?