<human>: Can you condense the text into three sentences or less?

My wife [f39] of 15 years recently attended a reunion with her college friends...alone...at a southern resort...bikinis and beer!  I [m48] was invited, but declined because the group really isn't my cup of tea.  Not that they're hostile, just they're caught up on reminiscing about the good ole' days.

The group parties  pretty hard, including my wife. 

I had expressed that I wasn't comfortable with her going alone to what appeared an extended pool-party alone with her old drinking buddies, including an ex-boyfriend who had recently announced he was now single. 

My wife went into a heated defense and cried that she really wanted to go. I relented and said go. But, just after her departure I couldn't remain silent and told her by text I was very unhappy (pissed) that she elected to go alone knowing I was not comfortable about it. She continued anyway and assured me she wouldn't drink too much while there. I wasn't satisfied. She went ahead anyway. 

My discontent ruined her weekend, and I am angry that she went even though I expressed my unhappiness about the nature of the reunion (weekend long pool-party). We're now deeply angry with each other and unable to reconcile. She thinks I'm being insecure. I think she's being naive and inconsiderate. I found myself lying to friends and family about where my wife was that weekend because it was too embarrassing to say where she was.
<bot>: So, am I being to possessive? Or is it reasonable to expect my wife to exercise some restraint about what type of reunion is acceptable to attend when I'm not also there?