I've split up with my short term girlfriend twice, thinking it was the right decision, yet now I want to try and get back with her. Why am I so confused?

Relationships should be created based in different qualities, two important ones are maintaining a good communication and creating boundaries. When we are with someone we like a lot we want to expend as much time with them as possible, and in the process we forget that we need time for ourselves. We need our space to clear our minds and to do the things that make us feel self love. There's nothing wrong with that. You feel confuse because you like her a lot and of course you have feelings toward her, you might have felt relieve when you broke up with her but then you realized that's not what you wanted. My point is that, you both need your own space, and to create boundaries, doing so doesn't mean you both want or love less. Perhaps, this is something to discuss with her. Remember communication is key, if you don't express how you are feeling towards each other or what you are thinking how the both of you will know what's going on there. --Hope this helps. Good luck!