Should I break up with him over this?

My current boyfriend and I have only been officially boyfriend and girlfriend since march and we are long distance... But in February when we were in the talking stage, I remember he followed a girl on instagram. They know each other from adult school, he teaches English there and she was one of his adult students. Is that weird that they followed each other on Valentine’s Day? I got extremely upset by this but never told him until last month April… and let’s just say it was tough. Obviously I got hurt but at the time we weren’t officially dating but he definitely acted and treated me like a girlfriend already. But on Valentine's day he actually didn’t talk to me all day long which caused me worry.
another thing is that he kept following girls here and there and more recently another students who happens to be an adult female. He is a teacher and only 28 years old. Is it wrong for me to be upset he follows his adult students back? They don’t even know he’s taken.

Should I break up with him over this?
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