Do you read your partner's messages?

Was in a long distance relationship for over a year, and I always had the slight suspicion that there'd be stuff going on; probably my own insecurities/jealousy. When we moved in together he left his Facebook/Skype signed on and I read through everything and he'd been talking to girls in a romantic/lovey/sexual sort of way and was planning to meet up with him. He'd arranged to meet up with a girl behind my back and had done it too... Although nothing went on, I'm glad I got in when I did or he'd continue with it.

I read his messages and everything from then on because it was difficult to trust him for a while. Don't do it now, though.

When I was like 15 yeah but grew up, it's an invasion of privacy and complete disrespect to someone that's supposed to be important to you

I have probably alot. But I worry due to ex's in my life...