Why is this happening?

I'm in a long distance relationship and the problem is that we often argue. We really love eachother but there must be something about it.. For example I sometimes am mean I know, but I can say I'm a really sensitive person. I consider that we are in a love-hate relationship. One day he makes me super mad but on the other side I want him so much. We haven't met yet tho, but we vidoecalled and voicecalled many times, so I know he's not a fake person. I seriously love him and so does he, I just don't understand why we argue so much.
Why is this happening?
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