Is It Worth It?

I've been with this guy for 2 years and 4 months. He's a great guy, good provider, has his moments where he's funny and charming and what not...but those moments are few and far between and most of the time, I feel like I'm in a relationship with a 4 year old. He's also very needy and clingy, and I'm not that type of girl...I need my space and time for myself. And just today, I had my foot hanging off of the side of the couch, and he grabbed it and BIT my Achilles Tendon (which I already have problems with)....Problem is, I really do love him and I don't want to hurt him. What to do?