I've been in a long distance relationship for about a year now and my girlfriend

I've been in a long distance relationship for about a year now and my girlfriend

I've been in a long distance relationship for about a year now and my girlfriend has just moved to London for work. She recently told me a stranger on a train asked her for her number after they've chatted for 5 minutes. Without hesitation or telling him that she's in a relationship, she gave it to him. Her explanation was she needed friends in a new and unfamiliar place. While I am very understanding about her feelings of been lonely I still felt very angry about her giving her number away to a complete stranger who's intention was to ask her out on a date. I feel it is wrong for her to be going out on dates with random people while she's in a committed relationship as I would never do the something thing to her. She says I'm just jealous. Am I wrong to feel like this?

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