Four months is far too long into the relationship to just pick up and leave without even so much as a goodbye email, but at least it wasn't four years. (And whatever you do, don't hunt him down on Facebook or Google. Give yourself some time to get him completely out of your system.

Tread carefully in this case; After all, you should already have a few new things going with women who don’t need you to walk away to be interested. Rather, see it as an opportunity to more wisely spend your time on someone else who will be.

If you want to learn more about what to do when she’s not returning your calls, sign up for The Art of Charm Academy.

If you’ve made three attempts to contact her and she hasn’t responded at all, it’s probably time to move on.

Other signs that she’s not interested are texting on a date, looking around the room for someone “better” to talk to or just generally appearing “bored” and not engaged.

Seriously, everything "appeared" to be going great, but now he stopped calling, won't return my calls or texts. It's particularly rough, because he seemed like the perfect guy. He might have commitment issues, or a fear of abandonment which causes him to bail on a good thing prematurely.

Now he's showing his true colors: he's a coward who figures he'll just pull a disappearing act and let things work themselves out on their own. Neither of which excuses the fact that he's a massive tool. Chances are, you aren't the first woman he's done this to. Eventually, someone will do the same thing to him and shatter his heart into a million pieces.

There’s a phrase that we like to live by at The Art of Charm: Don’t chase women, deals or street cars.

There’s always another one — often a better one — just around the corner.

For just one dollar you can start learning the simple, straightforward and easy to learn methods that we teach men who want to up their social game.

AJ Harbinger is one of the world’s top relationship development experts.

At some point, his past mistakes will catch up with him.