Your profile says you're 16. Shouldn't you be worrying more about what your mom says about snakes than what your girlfriend says about them? Hell, I even got married a couple of months ago to a girl who for the longest time said "you don't need anymore snakes Owen!" and just a few weeks ago I bought that new pair of baby blood pythons. She's come around a lot, so maybe your girlfriend would too. Or maybe since you're 16, and I'm guessing you still live at home, you should just go ahead and get a snake if you want one and can care for it. Because you, not your girlfriend, will be the one living with it and taking care of it. If your girlfriend gets upset about it and leaves, then why would you want to be with a girl who doesn't want you to enjoy your hobby anyway?