<human>: Give me the gist of the text in a nutshell

I'm 25m, she was 21f, and we were dating for over a year. We broke up just two days ago. We shared practically everything together. We went on vacations, we spent every single weekend together, met each others families; we were pretty much inseparable. Towards the end, we started resenting each other for a lot of things - her neediness, immaturity, and she hated my independence and always wanting my time alone - but then she went and topped it off by cheating on me. I was and still am pretty devastated; I don't get why she would have done it. It's really affecting my self-confidence. I keep asking myself, what does this guy have that I don't?    

I think the worst part of the whole thing was she kept stringing me along towards the end, saying "I love you, you're the one I want! I may have a crush on that guy but I love you!" Like a fool, I went along with it and was ready to do anything to get her back. Finally, I woke up the morning after she told me she told me she kissed the guy and I told her never to speak to me again.  

Does it get easier, Reddit? Does that feeling of something always missing ever go away? Do you ever stop thinking "I wonder what she's doing right now...?" I may meet other girls, but will I always specifically want *her* back? I've been cheated on before and was a little more devastated because the guy was actually my friend. This time, I'm a little older and a bit more mature, but I still miss everything about her.
<bot>: Ex-gf who was so obsessed with me ended up cheating on me. I don't know what to do with myself.