Some people get a greater sense of "well being" and confidence from a cycle - for shits & grins when you get a chance and you're cleaned out of everything go get a full physical and see if any of your natural hormone levels are low.
Outside of that sometimes you just need to get outside of your own head and focus on making yourself happy and not relying on someone else to make you happy. You need to find a balance of happiness for YOURself and YOUR life - with or without this girl because you can't control or guarantee that all these things like a relationship are going to be perfect so that you can be happy. You need to be happy & confident in yourself regardless of what happens around you - this is what comes from the inside, not the outside.