My boyfriend hanging with his best mate's girlfriend - girls & guys need your advice

Guys, How would you feel, if your girlfriend text your best mate (who had just moved to the area and didn't know anyone), whilst you were away, and asked to chill out/go the pub with her? My boyfriend has recently moved to Bristol, where his best mate of ten years lives, and doesn't have any other friend aside from him. He spends a lot of time with his best mate and his girlfriend (who live together), which is cool, it cant be helped if she's there. So my boyfriend moved into this houseshare 6 days ago, doesnt know anyone yet, but prob because he's spent nearly every night at his best mates flat. My boyfriend's best mate went away for the weekend with his uni mates, and my boyfriend couldn't go for financial reasons as it was too last minute. So my boyfriend is sitting on his own in this new house, and his best mate's girlfriend text's and asks if he is in town. She said would he like to go around to hers (his best mate's) and chill out/go the pub. They have only spent time together when his best mate is around, because she obv lives there, socializes with them. How would you feel if your best mate went around to your girlfriends to chill out whilst you were away? Bare in mind you dont get on brilliantly with her, you just accept her because she's your best mate's girlfriend. I found this out tonight, that my boyfriend was cycling to hers and I don't know whether I over reacted or not, because this is the first time they have hung out on their own of a night, and he is staying over. I wonder if his best mate knows? Is she hot? No, she isn't (dont mean to be nasty), I wouldn;t even say pretty, but obv he didnt want to stay in this new houseshare of his and try and get to know his housemates better, he'd rather cycle 3 miles to hang out with her. My boyfriend is very good looking guy, works out, a charmer, so its easy for any girl to be attracted to him. I've met her a couple of times, she's alright like, nice enough, not rude or anything, but just feels a bit weird if you know what i mean..... Girls, do you think that's weird? We've just gone long distance (been together 3 years), hes had to move away to do this access course for ten months then coming back nxt July.

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