Most Helpful Guy
It depends on what he was doing... I am naturally flirty and openly talk and tease anyone, it just so happens when I do this with a girl it is perceived as flirty. But that is just who I am and I think it makes daily life more fun.
Now I don't know what he was doing on social media as I don't really get into all that, maybe it was stepping over a line- but for me, being friendly and forward with people is just who I am, and I should not have to change something so foundation for myself for someone, it should be a naturally fit- maybe you are just not as much of a fit as you thought...
Most Helpful Girl
Flirting with other people is a major turn-off to me. It's just one of those things that really bothers me. Like, either be committed or don't be in a relationship with me. In my honest opinion, flirting with other people is not cheating but it is certainly disrespectful to your partner and it would lead me to believe that the guy doesn't care about me very much.
So, it's totally understandable that you would be upset about that. Some people are just flirts by nature and they may not mean any harm by it. However, it's definitely something that can cause tension in a relationship so if you still want to be with him then I think you need to talk to him about this.