<human>: So... I had a bit of a whirlwind romance with someone I thought was the girl of my dreams.  Did the dating thing for a few years after meeting, proposed, planned a whole wedding together, etc.  I was really on cloud nine.

I've always been a bit of a hopeless romantic and IMO treated her like a princess during the course of our relationship.  There was even a good period of time that I supported her entirely while she looked for work post college.

Well, fast forward to a few months before the big day I'm still utterly clueless with my head in the clouds when she comes home, breaks things off in a matter of an hour and drives off to go stay with her parents.  I'm, needless to say, devastated, but I try to piece my life back together.

A few weeks go by and the roommate of one of my groomsmen calls me because he "needs to get something of his chest."  He's known for a while that my ex-fiance and one of my best friends had been sleeping together for a while and couldn't carry the secret anymore.

I haven't spoken to either of them since this incident but it's been well over a year since everything happened and what I'm asking my fellow redditors is how does one get back out there when they have such crippling trust issues?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Fiance had an affair with one of my groomsmen and I have no idea, even a year later, how to work on getting my trust in other people back let alone successfully date.