Do exes come back after a rebound relationship?

Anonymous
So I was with this guy for two years then two almost three months ago he broke up with me left me confused and heart-broken, two weeks later I find out he's dating someone else, I was really hurt because before he decided to leave me he said he still had love for me and still wanted for us to move in together and have puppies but after he started taking to this girl he said he wasn't happy with me any more, is this a rebound or the "grass is greener on the other side" thing, any advise on this?
Do exes come back after a rebound relationship?
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