I accused him of going on a date with another woman.

What was originally meant to be a group outing (without me) to the movies turned out to be what I call a "date" for my boyfriend, his lady friend, and his best friend tagging along. I didn't find out about the group change until after the movie, so I was upset. I don't know his lady friend.  All I know is that they've been "best friends" for a long time. From the few texts I happened to come across, she was flirty enough to set off my red flag alarms. I realize now that I overreacted by accusing him and now my boyfriend and I aren't talking. I don't know what to do. I'm still upset and jealous but I don't want to go crawling back to him.