Why did he kiss me goodbye after I broke up with him?

Anonymous
My boyfriend and I just broke up, so I guess he is my ex. we mainly broke up because the timing was off, we are both in college and just super busy. anyway, as I was ending the relationship, he kept kissing my forehead and he held me close for a few min and as he left he kissed me goodbye. why? none of my other boyfriends did that when we broke up...
Why did he kiss me goodbye after I broke up with him?
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