IS she playing games or does she love me!?

Okay, I'll say it in short term...SO there is this girl we have had a thing for about a year now she says she loves me and I love her but shes also my best friends shes been there for me when I went through hell and Ive been there for her 2...K, so basically she always tells me how she likes a bunch of guys and stuff and describes her feelings for other guys and she dates around and we planned to get married and all that but it pisses me off how she always comes to me when shes lonely or needs something she always asks for rides somewhere or for money and we make out even if she has a boyfriend cuz I'm like her only exception I talked to her bout my feelings towards her and everything and she says same thing but she said she keeps her options open for 2 years and if she doesnt find anyone else we will be together, My problem is if we love each other why on earth would she wanna search around or find other ppl, I feel like I'm her last choice or someone she goes to for help when she has a problem, I can't move on or anything cuz shes the ONE but why am I in this possision...is she just playing games with me or do you think we will actually be together after the 2 years are up!? HELP ME PLZ!!!!