Don’t. Literally just don’t send a message when you’re emotional, upset and angry. Write that out on a piece of paper and get your feelings out that way for now.
If in a week or two you still feel the same way, and still want to reach out and explain your feelings about the situation to try and get some more closure, write a message when you’re calmer and more collected, and can write a more mature message lol.
The harsh truth is you’re broken up now and what he does is none of your business, he’s not wrong for having a dating profile and if he’s got issues he needs to work on, that’s on him. I’m really sorry they affected you so negatively and I’m really sorry you’re so hurt by him and his actions, I’ve been there and it really fricking sucks.
Right now sending a message like that when you’re angry and emotional and bitter isn’t helpful or productive in any way.
Unfortunately, in my experience, closure often comes from within you and yep it’s actually really not fair.