It's been 2 months since my first ever love broke up with me. I never really liked anyone before him, but now, I'm turning into a serial flirt. I can't help but subtly flirt with all the guys. I haven't gotten over my ex so I don't want to date anyone, but because of my new habit, there are 3 guys who like me. Why am I this way and how do I get out of it?

You are that way because you choose to be that way, hoping the attention from someone else will be fill the void you currently have until you are emotionally healed. You can quit anytime you so choose.

You're on the rebound. But you need to becareful. You don't want to find yourself in a situation you're not really ready for.
You're doing it because you want to and you're enjoying it, and you can stop if you make up your mind to do so. It's called responsibility and maturity.

I broke up with my boyfriend 2 months ago and after a month of crying I've been doing nothing but flirting with every guy I meet. Why? Because its fun. And because now I can. Sometimes, especially after a breakup, you just need that confidence boost. There's nothing wrong with it... as long as your not leading anyone on. Flirting, when done right, can be purely innocent and just help to boast the confidence of both parties.

Sounds like your trying to get attention from the fellas.