it has been a long time and if you really want to wait for her I guess you could. I would take your stuff out, and stop paying half the rent. It was really not cool for her to change the locks and still have you pay rent. If she changed the locks, changed her phone numbers, and is out partying and getting friendly with other guys, then I seriously doubt she is "taking time off" wisely. It sounds like she is taking advantage of you and keeping you around as a backup incase she gets bored of partying.
She might get pissed when you stop paying rent, so be ready to deal with her crap.
Getting her jealous with another girl is probably not a good idea. If you find another girl or want to try dating then go for it. If you stumble accross her while going out with another girl, say hello and be nice. Dont try to plant your date where your girlfriend might be. The new girl might not like being used like that, and your old girl might see straight through your scheme and get pissed.
