How to deal with a jealous boyfriend

*This blog was originally posted in February 2014. It has been edited and updated.*

Dear Lauren,
Two months into my relationship, my boyfriend looked through all my text messages while I was sleeping. He found an old one from my ex. Three months later he went through all my emails and found a few from male friends. I have an extremely suspicious boyfriend.I have explained everything to him but he calls me deceitful, a liar, and untrustworthy.

I was outside at a party with a bunch of ...