Girls, My boyfriend took his ex to prom?

Anonymous
Okayy.
So I'm in a long distance relationship and I've never met my boyfriend (yet). I found out a few days ago that he took his ex to prom without telling me (she put photos up on instagram) and when I confronted him he said he never thought twice about it. I got a good explanation as to why he did including his mum wanting him to go to prom and him and his ex's family being so close, they've known each other since they were children. I'm just still not sure, is it a big deal?
Girls, My boyfriend took his ex to prom?
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