This guy asked me out and I have to answer on Valentines Day! HELP!?

Ok, so this guy asked me out [to be his gf] and I said I would answer him on Valentines Day. I think he's a player though. I mean, He said he dated 10 people already. < in his whole life. And he already had his first kiss. In text he is really sweet but what if he does that to all the girls? I mean His backround on his itouch is B<3R .... idk what if he does that to all the girls? It looks like he really likes me though. IDK what to do....And he asked to to be his valentine...and I said yes. Ive never dated anyone but i rejected 9 people.....IDK. He might be doing this to everyone and I'm scared He might break my heart...but I like him and he likes me....Idk, I need help. D; Please help. I'll consider all answers.