<human>: Can you succinctly summarize the text in 1-3 sentences?

I realize I'm being very immature. I know. Don't tell me that. I can't help it. Or maybe I can. 

Here's the situation. Been together 4 Years and It's our last week at home (we live in the same town) before we go back to school. (We also go to school close to each other). I've always been jealous since my first real relationship before her ended up with my ex cheating on me. Anyway. She planned to go to spend the night at a lake house with 2 of her guy friends from band. I know them, but not all that well. I was upset and expressed that to her probably in a way I shouldn't have but it is what it is. I didn't accuse her of cheating or whatever but I was just super uncomfortable with the whole scenario. I hate that I'm jealous and I trust her with my life. What can I do? Help!
<bot>: I got jealous and uncomfortable with her spending the night with two guy friends even though I trust her. How to not be jealous?