Any suggestions for getting over my distrust of women?

Anonymous
I'm a nice guy and have hung out mostly with other nice guys. In the course of that I've had numerous friends who have been cheated on. Also being the nice guy has caused me to be messed with by a few women and sometimes put me in the friend zone where women have confided in me of their real feelings and how they've slept around, cheating on other men.

The one friend I have who would probably be considered a bad boy has slept with two older married women at the house we share. This makes me realize how easily and often some women cheat.

Another incident that didn't help was when I used to deliver pizza and a woman in a bathrobe was trying to get me to come in because her husband was passed out drunk in bed unable to satisfy her (I'm dead serious).

I'm getting so lonely but I have purposely self destructed the last two relationships I was in before they got too serious out of fear of being hurt. What can I do, if anything?
Any suggestions for getting over my distrust of women?
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