My boyfriend has been hitting on girls behind my back, what should I do?

Anonymous
So recently my boyfriend had moved to a different country to stay. He's been acting weird for the past week or so, ever since school started for him but I just shook the feeling off and assumed it was nothing. But I got a DM on Instagram at 11PM from a girl who I didn't know, saying that he has been hitting and trying to 'hook up' with her best friend. She even sent me screenshots of the conversation of him asking for her best friend's number and him asking her best friend if she would date him in the future and also telling the both of them that we've broken up. Worst part is that, I have a flight booked in 2 weeks to visit him and I have no idea what to do now. Should I break up with him?
My boyfriend has been hitting on girls behind my back, what should I do?
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