Dun dun dun dun dun DUN DUN! You are the Lone Ranger, strong, protective, and free. You like to make other people feel good, and you're anything but needy. That must feel good.
This is just a shot in the dark, but I bet you enjoy doing hopelessly romantic things for girls, like sending flowers. However, at the same time you value your space, and the nice things you do aren't as much a measure of your devotion as of your eagerness to please. Be careful with that shit, because, as you and I both know, things tend to get ugly when you make someone fall head-over-heels for you, then you kind of pull away, and then their head comes off, and then there are maggots everywhere.
If getting someone to love with you is your main goal in all relationships, you need to re-evaluate. Make sure you reciprocate the feelings you seek. Your emotional detachment doesn't make you a bad person--the fact is, sometimes it's fun to be fickle. Just be careful who you're fickling.