Boyfriend found a hickey on my neck...that he didn't give!

My boyfriend and I were in the shower and he found a hickey on my neck. It is from my ex boyfriend, who I occasionally sleep with from time time. It takes us a long time to really break up every time we do.

Anyways- my current boyfriend found the evidence on my neck and kicked my out of the shower. Now he won't talk to me, what can I do?
Boyfriend found a hickey on my neck...that he didn't give!
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