<human>: Condense the text into a few key points

My gf of almost 7 months has ALOT of guy friends and I'm 100% ok with that, she goes out with them from time to time but I honestly don't worry or get jealous or anything because I go out with my female friends often too, we trust each other .

However, this time my gf is going out with one of her friends that she's known since before we started talking. I don't have any qualms with him and they've gone for nights out before, but never romantically. So my gf's friend recently got a few tickets to a city harbour nighttime cruise and instead of inviting his best guy friends he chose to invite her (I only point this out because my girlfriend was surprised by this too).

Is it bad that I feel weird and/or jealous about this, or is this the inner clingy alpha male speaking? Should I talk to my gf about how I feel? If so, how? I feel I should just let it go, but it's been bothering me for the last little while.
<bot>: Gf is going on a night cruise with guy friend. I'm wondering if my feelings toward this are justified.