I just found out one of my best friends is dating my ex and has been for the past 2.5 months.

I have two women who I consider best friends. I just have a really hard time opening up to people. There have always been times in my life when I'm closer to one or the other (generally due to geographical closeness). So right now, one of my best friends is back in my hometown going to grad school and I see her on weekends when I visit my parents. My other best friend is about 13 hours away. We haven't been as close lately, but she's the one I went to in January when I was freaked about a lady doctor appointment, she and I have talked about my house purchase, I've been talking to her about wanting to come see her.

Years ago when we were closer, she introduced me to a friend of hers from high school who she had dated briefly but was just friends with. After confirming it was okay with her, I started talking to him. He lived in another state at the time, they were friends, it was all good. He moved back to my hometown about 2-2.5 years ago and he and I dated off and on for a good portion of the recent past. I always knew he was kinda in love with my best friend who introduced us even though he vehemently denied it, but she told me she would never date him again, didn't like him. I would talk to her about when he was a huge jerk (it makes me look bad but he would repeatedly lead me and another woman on and I'd catch him in lies due to the other woman constantly tagging him on facebook). My best friend was always super supportive of me. And in some cases she'd even fight with him about the way he treated me.

Two days ago she posted a picture of the "just because" flowers she got from him. I stewed over it for a day and texted her today "Wait... So are you and [ex] dating? I need the details!" I was trying to go for interested-friend and not psycho-who-is-going-to-literally-die-if-you're-dating-him-friend. She finally responded that yes, they've been dating since January.

I feel like the biggest tool right now. SO embarrassed. I mean, I was drunk texting him LAST WEEKEND and he blew me off. Now I guess I know why! Neither of them said anything! I feel like every time I've tried to reconnect with him lately, they've just been sitting there laughing about how pathetic I am. How does one of your best friends just not say anything when she starts dating your ex? I can't talk right now. I seriously can't make sound come out and I'm on the verge of crying/throwing up. I don't know what to say to her. I'm so incredibly hurt. I just feel like I totally lost one of my two friends.