<human>: Condense the text into a few key points

What's a healthy relationship? Long story short we've been dating for about 4 years ago. Last spring I found out she'd been cheating on me for half of our relationship. She cheated on me with my best friend and numerous other guys. We tried to work things we've went to weekly counseling sessions last fall. I admit I have insecurity issues now.(Mainly from the fact that some of the guys she cheated on me with were ugly, and the opposite of me. Like everything that I personally thought was good about me[nice, being in shape, smart, loyal, etc] doesn't mean much to her and that obviously because of past actions the opposite is more attractive. But does it get better? Can it get better? I mean she's open with me. She'll let me check her phone/computer if I'd ask. Is it something I'm not doing right to work things out? Should I be in a relationship where I feel the need to check her messages?[Before this happened I never checked her messages or phone. And it was all there if I ever looked.] It makes it hard to get through these feelings because it's not just her it was my entire social circle besides 2 friends.
<bot>: My girlfriend that I completely trusted cheated on me. It's been 6 months of us trying to work it out. I don't know where I should "be" in the relationship right now.