I am ignoring someone i like a lot and he likes me too but I had to refuse him because what if we break up someday and he gets hurt.. am I wrong??

You both can be friends first so after you knowing him personally and him knowing you personally. You both can decide whether that will workout or not 

See it's totally fine and I think so you both should talk on it and if everything goes right it will be great for you both 

First of all it is common problem in youngster. Most important thing is first both of you need to know each other very well.you worry about him that's mean you care him.but, You rejected him because of breakup; it will happen or not in future is base less decision. Breakup word is come from uncertainty of love. As I said above you should must be know eachother and then make a decision of future. If strong  Understanding base is created by you and him, then there is no certainty of breakup.