How do you let go of the past?

Alright, it's been a little over a year since my ex-fiance and I broke up.

He was flirting with other girls behind my back and as far as I know he wanted to break up with me,
sleep with other women and then get back together with me.

I'm told that he got furious when I didn't go back to him. (we were together for 9 years)

And now I don't talk to him, he is manipulative and knows how to throw me around emotionally.

He was emotionally abusive and I didn't realize that until 6 months after we broke up, and I'm still realizing that actually.

I am over him, I don't want him back, I don't want him in my life in any way.

But... now I don't trust men, I don't want to be in a relationship because this might happen again.
But I also get lonely and I wish I had someone who would love me for who I am etc..

And yet, just the thought of it terrifies me, because this might happen again.

how do I get over this? How do I forgive the past? How do I let go?

Any tips would be great :/
How do you let go of the past?
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