<human>: Give me the gist of the text in a nutshell

Two of my friends from college are getting married tomorrow. Today we had the rehearsal and rehearsal dinner. I'm an usher along with two of my best friends from college who lived with the groom. We're at the rehearsal, the bride has already told us what to do so we are sitting and watching with one of their wives and another friend from college who will be performing music. The reader (bride's roommate in grad school) is sitting to the side with her boyfriend. Musician lady friend whispers that I should invite them to join us. She seems glad to do so and is very friendly. He's not saying anything. Banter continues, we rehearse some more, go to the rehearsal dinner. Sitting with my 3 friends from school again at dinner when reader girl and her boyfriend show up and join our table, she's next to me again. Throughout dinner, I just talk a bunch as usual to amuse myself. She is ON THE BALL with laughing at whatever weird shit I'm saying - more than my best friends. She jabs me in the ribs a few times and eventually I realize she's sitting WAY closer to me than to her boyfriend who hasn't said anything all dinner. Overall this girl has a great personality that is really clicking with mine in a somewhat unusual way, but she has a boyfriend in tow. Tomorrow is round two for the ceremony and of course, the reception. Should I stop being passive and look into things with this girl (I usually do not look to ruin relationships even if they are "meh") or proceed with a fun wedding weekend sans any girl-chasing as planned.
<bot>: Pretty sure I got flirted with hard by a girl with a boyfriend at my friends' wedding rehearsal. What should I do?