Should this stress me out?

Ok Peoples Problems, I could really use some opinions on this matter because it has been stressing me out and I want to know if this situation would stress any others. So to start the situation is my girlfriend has this new guy friend and although I really don't think she would ever cheat I'm stressing over this new guy because of the manner in which they are chilling and how often. Now this whole thing started on February 9th me and my girlfriend had an argument and she lefty house pissed, took the lingerie I bought for her, blocked my number and went home. Then while she was at her house a guy hit her up on Facebook and they ended up hanging out that same night at her house. I did not know this until the next day when we made up. This made me nervous but I just let it go. Then two days later it's Valentine's day, me and my girl planned on going out to eat but after hanging out with friends we didn't feel up to it so we just got some KFC and I figured we'd go out and do something later, she said she didn't feel like doing anything so she left saying she was going to hang out with her friend Jennifer. I don't hear from her for the rest of the day untill I call to find out she's with the same dude leaving a bar and he's taking her home. Then they chilled for the next 3 days after that, four days after that he stopped by her house to move furniture for her and then left. Then they chilled for 3 days after that. Now it's even got to the point to where she is going over his house to watch movies and he's buying her food. Is this OK? Should I be stressed? Am I a complete idiot for thinking this is fine in any manner?

Hello Anonuser, Based purely on the information that you've given, my reaction is that she's baled out on you and moved on! Have you asked her outright what's going on with her and this other man?

Hi there! I know I situation like this can be stressful. My advice would be to talk to her and let her know how it is making you feel, because I do think you have some right to be upset. Just keep your head up and be honest with her, if she get's angry at you for that at least you can leave the situation knowing you did all you could. I hope everything works out for you.

Hi! I'm sorry to be blunt but this doesn't look good. I think you should talk to her, calmly and relaxed, to let her know how this is making you feel and ask her directly if you should be worried or if there's something wrong. Remember to be very calm; no need to jump into conclusions. Best of luck!