What am i doing wrong?! WHAT IS WRONG WITH ME?!?!?

can someone please help me?
ok, so i love this girl Koda, (her full name is dakota but i call her koda) and we've dated twice before, not with a lot of success....
And we have both told each other that we love the other. Like LOVE love. Then, she goes off and dates her ex-douche-loser-ass-hat boyfriend.
So im all, OK ill wait.
SO I DO.
and now its this past fall, she dumps him. Im excited, but we werent exactly close over teh summer and i kinda dated this girl and she was with her loser-boyfriend.
(^^ was i just supposed to sit there? Was it bad i kinda dated someone while waiting?)
Im all excited that she is finally available and then WHOOSH
this dude with 10 inch long hair swoops in. NOT KIDDING.
The kid is like 6'7" and about 5 lbs. ON A FAT DAY. He is so freaking skinny its frightening almost.
I was completely taken off-guard.
BUT, i want her to be happy so i think, "This cant last." NOW ITS FEBRUARY.
guess who is still with lurpy-mclonghair.
guess who is still alone?!
What am i doing?! WHAT DID I FAIL AT?
Also, she has gotten very loving and clingy to me. We have hung out A LOT lately and she hasnt ever seem him, but she totally just ditched me for him.
IM SO CONFUSED
can someone help?
I am in love with this girl.
like hard-core love.