Friend with benefits going on holiday to France with a hot girl.

I'm unsure if I should be worried about this.. she's an awful lot hotter than me. Do I have a justifiable right to be angry if anything happens over this holiday? When we started sleeping together we laid down all the ground rules and one of the main ones was 'no sleeping with other people', the clause being that if we wanted to start sleeping with other people then we'd stop having sex. I worry about STI's and stuff. I am also a bit jealous which I know is bad, but I'm sleeping with him purely because I'm not into relationships right now and I hate the thought of sex with strangers. So basically I'm sleeping with him because I want to, but I am starting to worry that he's using me for sex while pursuing other girls. Arghh should I confront him about it? He insists they are just friends but I'm pretty sure he fancies her.

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