As was mentioned above, YOU CHOSE to break up with your GF, nobody made you.
You chose your mom over your GF, its as simple as that.
Sick, but simple.
Why on earth you would even consider that, idk....
May have something to do with being such a good teenager and young adult. Angering and disappointing our parents are a natural part of growing up. It helps us assert and find our independence, forces us to mature, because that's when most of our stupidest mistakes are made. Hopefully in the end it proves our parents love us no matter what kind of dumbass choices we make, or it teaches us that they're self -centered turdsacks, and that we're better off without them.
Seems you skipped that phase entirely...
Now for mother dearest...
She survived HER HUSBAND DYING, no doubt she will survive you dating. So stop falling for her old age home theatrics.
Moving out won't help your plight at all. She'll expect keys to your apartment, and go through your things, then scold you for having condoms, or something equally retarded... Then you throw them in the bin to placate her, and dump another GF for NO GOOD reason AT ALL.
Rinse, wash and repeat sick cycle.
Reconcile with your GF before too much time has passed, tell her you choose her, not your mom.
Tell her you were scared, stressed and stupid, that you panicked because it was the first time you found yourself in that situation... that she must please try to forgive you, you know better now.
Your mom won't live forever, what are you gonna do? Wait until she keels over and dies before you date, or fly solo toward your own grave?
I don't mean to sound nasty, I promise I'm just being blunt, you have a back bone guy, learn how to use it already.
Seriously, get that lovely girl back, before you lose all self -respect.