Boyfriend broke up with me because I was flirting with another guy?

Anonymous
I play volleyball and recently we got a new substitute couch who's gonna coach us for 6 months. He's a great guy and yes he's attractive, but I do not see him in a sexual way! He's a tease, he teases all of us girls and we tease back. It's just fun! After one game I headed home with him because he lives in the area. I called my boyfriend to ask him if he's home and if there's anything to eat and he said he's not home and that there's nothing to eat, so I went to the near by grill with the coach. We took a table to eat. While eating we were talking and laughing and yes we flirted a little bit, it was really just subtly. He knew I have a boyfriend and I was often talking about him. When we were done, I came home. My boyfriend came 10 mins after and dumped me on the spot. Apparently he was at the same grill sitting near by and he heard everything. He doesn't want to talk to me, he's been ignoring my messages and calls for 3 days now. He said he doesn't want to see me ever again. That he can't forgive flirting with someone else. Is this really my fault? We've been together for 4 years, I can't believe this is happening...
Boyfriend broke up with me because I was flirting with another guy?
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