Saying "I love you"

My bf said he loved me after a about two weeks of dating me. I'm yet to say it back and he knew at the time I wasn't ready to say it back. He's passionate about things. Is it too soon? We go to the same school so we see each other everyday. Both 17. His last relationship ripped him into two cause of him ex cheating and breaking up with him over and over again for another guy. Is it too fast?