if tis person is funny, cute, kindand loves you ,but you cant return the feelings but you dont want to hurt them?
Of course there are any number of ways to approach the situation, you can continue to take advantage of the situation and the continued affection of this person, which will likely end up with them getting hurt. Of course you could also try to help them understand that you don't feel the same way about them and continue to hang out but only as "friends" which will also lead to them getting hurt.
You could also just stop seeing them and make sure they understand that it is just because you don't feel the same way and you don't want to hurt them, but of course this wil also lead to them getting hurt. But it might be the best because eventually they will get over it.
From a social sciences perspective, in a large percentage of cases it is the female who has to break off the relationship. In general, males tend to stay in relationships longer. I expect there is a subconscious desire to not hurt the female; however, there is bound to be hurt that is occurring when a male is not able to reciprocate the feelings. It is as if he is waiting for her to break it off, so he will not seem the "bad guy."
Tell them how you feel, honesty is the best policy. Sure, it might be a bit awkward at first, but after a few days he/she will get over it. The most important thing is that you keep your friendship going. If they truly love you, then he/she will understand and do what's best for the both of you.