Yeah, OptiPrime's right dude. That's the whole reason I have my girlfriend right now, practically. It's not healthy but basically I surrendered to her advances.
The thing with the question in the topic is relative. See, if you love and lose, you learn something--that scenario, for better or worse, contributes to your evolution as a person. Every girlfriend you have, when it's over, you will come out a little different; some might rub off on you, some might change your outlook on life. If you're me, then your string of bad luck has turned you into a very bitter and indifferent person who actually does prefer to be alone; even my new girlfriend now, I'm sick of her already just because I don't like the whole codependency part of relationships (and since I have yet to meet more than like 1 or 2 strong-willed independent women in my life, they all end up being blithering weaklings who can't do **** for themselves and thus ALWAYS become codependent...).
If you value this sort of involuntary change as a growing person, then it is better to love and lose. Honestly, there are few things I have seen that make a person change, grow or evolve faster then the end results of a long involved relationship.
If you prefer to make your own fate and find that sort of involuntary change to be a hindrance, then I guess you would consider it better to have never loved at all.
Although I agree mostly with the former, despite my horror stories with women. To not understand love, to not experience some form of it in a lifetime, is to deny the very essence of human brotherhood.