is this a rebound?????

Em
I am a junior in high school and was with an sbusive guy for what would've been a year on dec 10th. We broke up 21 days ago. It wasn't good but I got out at least. This boy that I've had a crush on in the past and have known for six years (jeez) has broke up with his girlfriend two weeks after I got out of my relationship. Me and him started hanging out and talking all the time, we were really enjoying hanging out and being in each other's company. (We went to a school play, a winter parade, and a basketball game together also) 
A couple days ago he admitted he had feelings for me and had feelings for me while he was with his past girlfriend. I admitted the same to him and we decided to go out with each other and not let my past boyfriend dictate our happiness we found with each other. I'm very happy it's only been a couple days but he's been so kind and I feel very happy. Is this bad? Is this a reboun? Am I just being stupid? Is this way too soon? Please help