This actually happened to me.
We started Jr high at the same time 7th grade, so I finally asked her out around 8th grade. But we were friends since 7th grade but never took it to the next level until 8th grade.
I was dating my GF, then one day she stop coming to school. So I was like W T Hell. And when I call her house her mom would give me some BS, like oh she's not here. And I'll ask where did she go, then her mom would say she at her cousin's house. But been young you don't know WTF's going on. So I don't how, I got the info. Someone knew something but didn't tell me. So I found out that my GF was force to marry this guy.... OH yes I remember cause a couple of week later she came back to school, but she would hide from me and not talk to me. I was like what going on? And when I try to talk to her she would turn her head the other way. But I was too stupid I didn't understand what she was going through. And since she was marry it's the Hmoob BS that she is no longer allowed to talk to any guys. other than her hubby.
That day I saw her new hubby picking her up after school I was so piss I was going to kick his Asian a$$, but all my friends held me back,and it was right outside the school bus were everyone was getting off school. Even the principle was out there too. After that day I never saw my GF. I think her hubby transfer her to a new school. Cause I never got to say good-by to her. Gosh this was about 15+yrs ago. I was around 13-15 yrs old when that happened.
Young puppy love huh.
Most if not all guys will have gone through something like this where their gf is fixed up to marry someone else, or she runs off and marries someone else while seeing him too. Even applies to mature, of age people not just teenagers. That's the way it goes in a lot of cases, they'll talk and see more than one person, guys when being bachelors, will more than likely have more than one gf. Girls will not always have more than one bf, but she may still talk and communicate with more than one guy while steadily dating just one guy.
If she marries the man her parents like and chose for her, it doesn't necessarily mean she doesn't have a backbone, she just respects her parents wishes. "Neeg hmloog lus." All traditional girls were conditioned to be "txim txiaj" by respecting mom and dad and whatever wrongdoing you make will fall back and reflect back on them.
Even females go through this too, where the guy married someone else and she was just the back-up gf. If a guy I was seeing married another girl, I wouldn't throw a fit. Sure I would be heartbroken and even felt used and will wish him to rot in hell, but I would not implore him to not marry her or fight to keep him. Only naive, neeg ruam tsis paub tu siab would want to steal their lover back when he married another. You'll get the title homewrecker and that's bad. And if he married someone else, I tell myself she was obviously better than me so that was why he chose her instead.
People just need to let it go. You can feel bad if it makes you feel better, but as time and years pass by, they will just be a part of your distant memory.