<human>: So my girlfriend texts me today asking me if I would mind or be jealous if she slept over at her ex-boyfriends house with another guy because "she knows I get jealous easily". She reassures me that she's not interested in her ex-boyfriend (of 7 months) anymore because they broke up 8 months ago and she certainly isn't keen on the other guy because he's her bestfriend. 

My friends have mostly told me that I should mind because I'm her boyfriend and her ex-boyfriend seems to still have feelings for her. I'm friends with the 2 guys but not close enough with them to feel comfortable with it. 

My girlfriend recently had a fight with her group of girls and they all have sleepovers without her now so I feel mean telling her she can't go sleepover with these guys. 
Anyway, my question is should I let/feel comfortable with my girlfriend sleeping over with 2 guys at their house.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: = girlfriend wants to sleepover at ex-boyfriends house with another guy, reassures me she has no feelings for either, asks me if I would be jealous/mind. Should I?