I did not regret for BTC but often I remember one girl who i rejected in before something like 5 years ago and probably I'm regretting that I didn't chose her
A couple of times i had a dreams with her and try to make contact but she is already gone from this country and she is having a man next to her.. Probably I'm little regretting about that.
Never regret for something like that. You made your choice probably between her and somebody else. Just be happy with the person who is standing next to you.
I'm have regrets about one monthly payment from my job once. Me and my boss were having a drink after work and he suggested to pay me that month salary with BTC and i didn't accept the offer. Then BTC was really cheep 1000usd probably.. So guys this is my regret, now I could have 38 monthly payments..