@MMadness, you said "You've no right, none to involve his work colleagues in your insecurities. How disrespectful of him you are."
If you've RTFT, you should know that OP didn't involve his co-workers. He did. In fact she was upset that he had done so.
She said "I didnt get his work mates involved.He did.And this caused another argument because I was embarrassed that he had let on that I was in some way insecure.What if it got back to the woman herself and I look like a psycho?(Yes I'm acting like one but I'd rather as little people know as possible)"
@Cantthinkofanameeee, I think it's likely that he's just been stupid. I don't think he was obliged to tell you about her, but I can see how you feel that way now. If he'd just answered honestly the first time, then most of this wouldn't have happened.
It sounds like he knows you well enough to worry that you might feel threatened, so he left her out of the conversation when telling you about his day. Then you were out and saw her, she spoke, and he stupidly panicked because he hadn't mentioned her. From there it snowballed. His friends' "helpful" explanations have only made things worse. Now you're doubting everything, when it was probably nothing.
I think you need to let this go for now. Why not tell him you don't want to talk about it anymore until things have calmed down and you've seen a therapist or counsellor? Say that you reserve the right to discuss it again in the future. Try to focus on all the positives in your relationship. It sounds like there are a lot.
Please make an appointment to talk to someone who can help you see things objectively. You're torturing yourself; the doubts are going to destroy your relationship for something that is probably innocent. His misguided attempts to avoid upsetting you are a large part of this, but at the very heart of everything is the insecurity and low self-esteem that are a result of abuse in the past.
A good therapist will help you build yourself up. Once your self-esteem and confidence are higher you can come back to this, if you still need to. Until then, mentally put it away in a box, knowing that you can sort through it later.
Just love each other in the meantime. Put some positive emotional deposits in the bank. Love can rebuild your relationship and trust in one another. Remember, you don't have to put this away forever. Just for now, until you feel stronger and have some guidance on how to deal with it.
I hope you feel better soon. 💙💙