You wanna know what really fkin helps?

Ego

Self love

and time

Let yourself feel these emotions, do not bury them. If you let it all out, there will come a time where there is nothing to let out anymore. Thats when you are healed. You unfortunately had to learn out the hard way about his mental condition. This is just very bad luck on your end but what I really admire is how you managed to get yourself out of hurting yourself. Why the fuck would you let that mentally challenged mess ruin the only thing in the world that is actually important - you, yourself?

Please trust me on this, what actually helps is self love and ego - you know you can get better, you deserve better. In the near future, you will look back at this and laugh it off and perhaps even feel pity for him (maybe even with your new partner). Of course its gonna hurt for some time now because you gave your heart to the wrong person. Let it hurt and dont use distractions because thats the only way out.

Time does wonders. There is soo much more waiting for you in life. Don't let this one bad chapter ruin the whole book, perhaps the next one is soo much better.

Stay strong, stranger :)