How can I tell if its really semen when using a Blacklight

It glows.

It glows.

Right.. but there are different stains that glow.. there are some that are real light an some that are bright... I'm sorry I'm about to drive myself crazy!!

So can I say something here? Why does semen on his clothing mean he's cheating?

I mean, I don't know if he is or not but simply having semen on his clothes isn't proof of cheating. He could be only masturbating and just being messy about it.

If a relationship is so bad, you are hoolding black light to his clothes, just leave it is already over