I don't even really remember I think, I don't even really feel like I've "dealt" with it. I'll tell some of my experience but I won't go into too much detail.

For us, we were even talking about marriage, but I did something wrong and I felt helpless after the break up, I couldn't do anything, other problems arouse and I even started planning suicide.

I tried talking to other people, some related to the situation and some not, to get perspective on stuff, I even got a new job, but depression hit me hard once I started, so I quit soon after to get that under control which was fine, my financial situation was good enough to do this at the time.

Eventually I just started thinking about what I wanted in a relationship and somehow I stopped blaming myself, but now I have a anger I don't know how to deal with towards her and her family, we see each other once a week during our martial arts class, and it keeps it kinda fresh on my mind but I love the class so I decided it's worth it.

I'm talking to someone else, not really as a potential romantic partner but someone who I can be good friends with and if it goes that way then it's a plus. I didn't have the biggest friend group before and it got even smaller after the break up, so I'm trying to branch out.

I guess that's how I dealt with it, focused on a hobby, and making new friends, making sure I got to talk it out with various people to make sure I didn't get into an echo chamber (which my brain and family would be a major one)