Girlfriend going on other "date"?

my girlfriend has a friend at work who a male. she likes him in a friend way and she swearers that he only like her as a friend. which i think is bull. she wanted to go see a movie with him alone. and i said no that's a date and im not ok with that, i told her she either has to take me or some friends because... show more my girlfriend has a friend at work who a male. she likes him in a friend way and she swearers that he only like her as a friend. which i think is bull. she wanted to go see a movie with him alone. and i said no that's a date and im not ok with that, i told her she either has to take me or some friends because im not ok with that. she got really mad and we got ina a big fight. who is wrong here me, or her?
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