A "broken heart" is a Heart that is expanding to increase its capacity to Love.
The pain you feel is the resistance to this expansion.
Once you get the hang of it and release the resistance,
the Heart will expand and open like a flower, without the pain.
This will happen.
You can expect it.
The resistance you experience is resistance to Loving YourSelf.
The expansion you are experiencing is the increasing capacity to Love YourSelf.