I don't know if it's PTSD but whatever you are/were going thru it doesn't sound good. It would be a really good step for you to see someone like a counselor and talk to them. They will help you deal with what happened and your feelings.

You are the only one who can control how things affect you. If you know that there is a possibility things could go bad with Erin again (which it seems you do) and you know that would put you over the edge then you need to stay away from him.

It's not getting over it. It takes time to get over things sometimes. But I think you need to really think about what affect he has on you. Try to figure out why and then what you can do to avoid being in that situation again.

No person is worth such stress, anxiety, fear and anger even if he is being kinda nice now. I don't think he is a safe person for you to be around.

Is he someone that is necessary in your life? Why is it so important to you what he thinks and feels? He is only as important as you let him be and he really can't hurt you of you don't let him.

Hugs sweetie,
Heidu

The highest reward for a person's toil is not what they get for it, but what they become by it.
John Ruskin