<human>: My gf and I have been together for 6 years and I met a female friend in school 1 year ago. My friend and I got along really well and texted a lot. Every now and then we sent each other somewhat flirty texts (which were more like dirty jokes and making fun of each other). Most of the time we texted school-related stuff.

My gf found out and her trust issues exploded. My gf asked if I cheated and I told her I have never cheated. But she is still very tender about the subject and still thinks I am/have cheating/cheated. We fight almost every week over trivial things and about my friend. The relationship is pretty rocky.

I know I shouldn't have sent inappropriate texts but they were just jokes between my friend and I. And I seriously have not cheated. For a few months I even let her have all my passwords for my devices and online services like facebook, but it didn't help her trust issues; she wanted to check my phone every day. I changed my passwords eventually because the fighting didn't die down and I increasingly kept getting frustrated.

At this point I'm very exhausted of having to keep hearing accusations of me cheating and her checking my phone. I don't want to sound like a jerk but sometimes I feel like she is somewhat overreacting.. What should I do?

Can you summarize the given text in a few sentences?
<bot>: Female friend and I [M22] sent flirty texts (but never cheated) and gf [F24] found out and we fight every day. Wat do?