TL;DR I more or less want to be there more for myself.

So I have been with a woman for 1 and a half years and after building up a very strong friendship and a beginners relationship she left me.

It developed as a friendship into a very strong bond and I was very much in love with her. So I finally had the courage to ask her out to a party, here she met another guy. She has been dating him since then.

My heart is broken and I would very much appreciate some tips to be a MGTOW.

EDIT: Hate was the wrong word to use.