You did not over-react.
Obviously she cares quite a bit about you to unfriend him however I'm inclined to think that your GF enjoys all this attention from other guys. My guess is that you already know that.
The problem with this is that while she got rid of Adam now, it may be a matter of time before he surfaces again or some other guy takes his spot.
If this girl is future wife material, there may be an "Adam" type in the picture. Hoping she outgrows her attention-seeking ways, is not a good plan.
I personally think Adam needs to calm the hell down and realize that Samantha your girlfriend is taken. I think you should have talked to adam first about this and if he kept doing it then this would have been perfectly fine. I think you overreacted just a little
Well yes, however maybe she may like that you put up a fight for her.
Sometimes you have to fight for your lady and let the chips fall where they fall.
My girlfriend and I have been dating 9 months. We met at work. She said upfront that she had 3 guy friends. This was no issue with me. But, this 4th guy was an ex coworker at our job, he quit before i started. He was the IT guy. Samantha (gf) and Adam (him) regularly contact on facebook. At first it was fine, until he would flirt all suttle like. I asked my good friend at work if he remembered Adam, he said he was cool dude and actually I remind him of Adam. I asked if i had a right to be pissed. He told me he overheard Samantha say she was madly in love with me. He also said when Adam first got hired, he went on one date with Sam, which surprised the hell out of me bc she said they never hooked up and were only friends. Anytime Sam needed help with her phone or computer acting up she would contact Adam. No big deal. But about 2 weeks ago she says Adam sent her an email (i believe it may have been a text) stating an accountant job opened up at his work on the other end of the city. She dont drive but he said he would take her to and from work. I didnt freak out. I calmly said i didnt like the idea. Sam posted 14 pics from her sisters graduation the other day and Adam commented more than 5 times "so gorgeous!!". I finally snapped!! I told her to unfriend him and forward any further inboxes or texts to me bc i was totally uncomfortable with this situation. She unfriended him on FB and unfollowed him on IG. She said she would do anything for me. Did i overreact?