<human>: I am a guy. My girlfriend of 3 years broke up with me last week and although I have had a lot of support from my friends, I still don't feel right. I have enjoyed the last week, I have been able to speak to my friends, train my sports, play my games, eat at better times and have better food. These things are all things I enjoy, and I have laughed and appreciated the company of everyone around me.

But it doesn't feel right. Even when I'm enjoying myself, inside I'm not. It's the little things, like that when I do something of merit in my sports training, I don't have someone to tell me they're proud of what I achieved when I tell them about it. They're just not that interested. I don't have someone who I can talk to about my boring day but who can appreciate it anyway.

Our break up made perfect sense. Having been in a relationship for 3 years and with her leaving the country for a year, we knew it would be difficult. But it was only a month in when she said she couldn't do it any more. It wasn't the distance, it was just that the distance had helped her to see that since we'd been in a relationship for 3 years, since we were 17, it would be a long time before anything actually happened within the relationship. That is, neither of us are interested in being married until we are much older. With that in mind, why were we in the relationship still? Were we not depriving each other of the experience of having any other partner in adulthood? Of being single even? This made sense in my opinion. As a result I managed to keep my cool and agree with her. 

What crushes me is the thought that when she ends up in a new relationship (and she will, because she is amazing) someone else will be able to bring her more joy than I could in the 3 years that I tried. I would have failed in being nothing short of the best thing she could have asked for, and that is awful to have to come to terms with bearing in mind that she has been the best thing to happen to me so far in my life.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: What can I do to get over my worries that my ex-girlfriend will be much happier with someone else, and how can I find a way to enjoy what I enjoyed before?