The problem with thinking that your happiness will come from being with a partner is that you are so dependent on the other person.. when you need to depend on yourself. In needing to be with someone else to find happiness you are creating so much pressure (although initially during the newlywed phase it wouldn't be noticed) that chances are with time you will empty the life force completely out of your partner. Which is what I worry that I did to my H!
I've read a few books lately.. so I can't remember if it was from the Why Mars and Venus Collide or For Women Only.. but one of the stated that women are responsible for finding their own happiness... to the level of 90% and that they can expect there man to only be able to top off the last 10%.. now I'm not sure if it's the same when speaking in terms of two women.. but it is something to consider.
I think if you would truly find happiness within yourself that someone will come along (possibly your gf) when you aren't actively thinking about it or needing it all the time. KWIM?