Im stuck in a lesbian triangle

Okay first of all there is my ex, we were together for 2 years on and off thing. and once we were off for as long as two weeks i went out with someone. but then got back with my ex. we are off for good but she still loves me, i lover her too but im done its the same thing over and over. but i dont know i miss her at times. then the girl i dated told me she still loves me and she wishes that i never broke up with her, i like her but i dont know we are complete different. then the third girl im in love with and she loves me BUT she is straight and doesnt want to be bi. she says im the only girl that made her feel this way.... i dont know im stuck

It's not really a triangle, you have deduced you don't want to go back with your ex, the other girl does not want a realtionship and the one who does, you can't see being with. I do have to point out though that it is okay to be different, I think it gives you more to work with, discovering things about one another, exploring different avenues, w e may not have normally.