I hate her for breaking my heart

so found out why she ended things turns out there was another guy, she got with him a few weeks aftee we broke up but told me she only wanted “space” for now and she told me to wait for her until I a week before I found out just a shame I told the new person that we slept together, kissed and everything while they were together without me knowing I’m rlly mad but told her she’ll never get me back again I’m bettter now than before and she doesn’t deserve the best version of me