Advice needed…

So two of my friends were in a relationship until about a month ago when it ended. Now it was pretty far from healthy-constant fights and both were miserable-and this was not the first time they'd broken up. However one of them(person A) is determined to get the other back. Everyone in our group of friends, including person B, knows that this relationship isn't good for either of them and I've tried telling person A to just work on themself and wait(so has my boyfriend) but person A doesnt listen. I'm really worried about person A, they're my friend and acting in a more obsessive and compulsive manner, they're not themselves. My boyfriend thinks that me and him should sit down with person A to talk to them, but I'm not sure if we should even get involved anymore.

Should we just stay out of it? Or should we talk to them I mean they're our friend…