He said he loves me after 2 weeks.. WTF?

there's only one thing guys his age look for. . For the past 3 weeks i had been dating a 20 year old (and I'm 16) and just now figured out that he had a gf. I ALMOST did stuff with him, but didn't. He said the exact same thing to me and freaked me out. The red flag that's being set off is your women's instinct. I had the same feeling for the 3 weeks that I dated this guy, and figured out the entire time he had been cheating on me. Guys think that the only way to get a girl is by telling them they love them. I would handle this by looking closer into this guys personal life (i know this sounds creepy, but believe me.) he may be hiding some things from you. If nothing comes up then I'd still date him if I were you :)