What should ido when ilove one girl and that girl is getting married with other guy?

I've personally always asked myself what I would do it that situation and here is my answer: I would watch her, see if she is truly happy. If she is happy, and you truly love her, let her go. She needs to be happy and if that is what makes her happy it should make you happy. True love isn't about getting what YOU want it's about helping the other to get what THEY want or need. If she wants this then trust her. She knows what she's doing. I know it'll be hard to let her go... But believe me it's the right thing to do. And your love should get you through it all. I hope I've helped a little! <3