Therapy, exercise, having great friends around, getting things accomplished all seem to help.
My mother died when I was 13 and I survived, so breakups..while painful...are not going to destroy me or make me not have a heart. I try to look at it like we each learned from each other what we needed to and now its time to go on the next chapter. Heart even bigger for having loved.
So yes, it's worth it...but definitely worth looking at ways to keep out of trouble without resorting to a hostage situation girlfriendship. At least not right this second.