How often does this happens... we throwing away our future when the guy was literally in our face?

I have a sad story to share. I said hurtful things to my crush when I was a HS freshman. He was just joking (though lame jokes) and was going to ask me out but I reacted badly. I thought I was being insulted and reacted too quickly, too impulsive. These were my words:

''Well you look like a stupid rabbit. No I don't like you. You're nothing but garbage. Garbage, garbage. Me going out with you, keep dreaming, loser''. Little did I know what I've said would haunt me years later.

The worst part is I said all that while still liking him. Then he requested me on FB when we were in our early 20's but we never spoke about that event, we're with someone else already (he's engaged while I'm in a rocky relationship going nowhere) and I never apologized either.

I'm working as a HR specialist (I've studied business administration) and only need one year to finish my Master's. Meanwhile staring right at my screen, it's him under his white uniform, progressing in the medicine field. I've insulted a future surgeon, a stable, family oriented man. That was my future right there. I had it all at an early age and told him garbage. He's engaged already and well my relationship isn't going anywhere. My current boyfriend is nothing in comparing to what I just threw away when I was 14.

How often does this happens? My very first option was right there and I stupidly threw it away.

Updates
4 mo
I was an impulsive, immature girl that got offended easily by jokes. I misjuduged, thought I was being laughed at and reacted poorly.
How often does this happens... we throwing away our future when the guy was literally in our face?
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