I recently found out my boyfriend has been cheating on me with my sister, but he doesnt know that i know how do i tell him?
i was going through my boyfriends phone looking for his friends number(he said i could) and i saw a conversation on his messages with my sister. i opened it and it was full of messages like where they were sneaking around at or were they where going to meet up. i was shocked, when my sister said she was studying and sleeping over at a friends she was really sneaking around with him.(my sister is 2 years younger than me and him) how do i tell him i know?