OK...first I gotta say I wonder about the lives of the "ditch the girl" crowd. They always come out in these threads - even when the OP makes it clear that isn't an option.
Fellas - he wasn't asking for advice on his love life. And why all you divorced loners think you're qualified to give such advice puzzles me.
When I first starting shooting and carrying about a year and a half ago, I had already been married to my wife for more than thirty years. Frankly - she had a fit! When I discovered these gun forums and asked for advice - guess what kind I got?
I'm still married, thank you very much, and my wife has come a long way from the initial hysteria. Although I did and said a lot of the wrong things (as Kathy Jackson outlines so well at cornered cat) - I eventually mellowed out and so did she.
When she realized I wasn't looking for a gun fight, that I wasn't interested in being a hero, and that I actually had a clue about gun safety - she began to calm down.
She still isn't crazy about the idea, but understands there are bad people out there - and a last resort is better than no resort. A recent incident at a local dog park with an antisocial thug who wanted to give me a beating because I asked him to control his puppy (who was jumping all over our grandson) really opened her eyes.
The latest big step for her was when I had to leave town for a couple of days, and she asked me to show her how to handle my newly acquired K-frame - just in case. That really melted my heart!
Mind you, she hasn't actually fired a gun yet - but I showed her how to safely clear a revolver, load it, unload it, check it, double-check it, and dry-fire it. That may seem like a baby step - and it is. But I felt so much better knowing she was willing to have a loaded gun stashed in the bedroom while I was gone - and that she had come to the realization that her life was more valuable than the life of anyone who dared to break into our home.
Next baby step: Get her to the range on a quiet weekday morning when it's not crowded and have her shoot my .22 revolver and maybe my oh-so-sweet and well-mannered K-frame.
Who knows after that? I'd love to have her sign up for a class taught by a woman for women. We'll see...
My advice to the OP: Take it slow...assure her you want to be safe - and want her to feel safe. Make it clear that any confrontation on the street will be met first by de-escalation efforts including apologies, willingness to loose face, backing off, exiting the scene, etc. Let her know that the gun comes out only when all else has failed.
Real men don't need to prove they are real men - especially to a psychopath whose opinion of you doesn't matter anyway.