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

As a quick catch-up, my ex and I dated for just under a year. We were young and naïve and had a lot of problems. I ended up leaving because it became too much. But we remained "friends" for the longest time, having sex now and again, sleeping next to each other, etc. 

A few months ago my parents kicked me out and I had no where to go, so she talked to her mother and they took me in. I have a steady job making amazing money, I pay rent as well as gas and groceries, and everything has been going well. That is, until the fire nation attacked.... just kidding, but seriously, it was going well until she met someone new who walks, talks, and acts exactly like me. The only difference is that he's skinnier.

They've now been dating for almost a month and it's breaking my heart. I've always loved her, always wanted to be hers and hers alone, but am afraid to tell her in fear that she might take it the wrong way or think that km purposefully trying to ruin her new relationship. 

I am extremely happy for her and her new found happiness, but she's explained to me how she doesn't see it lasting because she'll be moving away and the new guy can't follow. Or as she out it "our futures don't match up". I want to explain to her how she makes me feel, I want to explain that I truly believe she is the love of my life and that she's with the wrong guy. But I want her to be happy and I'm not sure what to do.. please help.
<bot>: I want to explain to my ex that I want to be hers again, but she's with someone new. Should I confess my thoughts and emotions, or bury them deeper for her happiness?