How common is it for a guy to be turned off by his girlfriend crying?

We dated for 2 months. I started tearing up randomly while my boyfriend and I watched music videos. I am on my time of the month. I get emotional sometimes. At the time I wasn't sure why I was crying. I now realize it was because I was going to miss him when we said our goodbyes. (We don't see each other on the weekdays) How common is it for a guy to get turned off by this?
How common is it for a guy to be turned off by his girlfriend crying?
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