All does not go well in every relationship. People date, determine that they like each other, maybe even think it’s love, and then the other person pulls away.
We have all experienced heartbreak at some point in our lives, and so should our characters.
Consider one of your favorite characters, regardless of age. Now put that individual in a romantic relationship.
If the character is young, it could be the devastating loss of a parent due to indifferent. If a teen, the loss of that first love.
How would you write that scene?
Your task is to choose a character that is either one you are currently working with or create a new one. Consider the possible romantic relationships that could ensue.
Narrow the possibilities down to one and write. You must take into account all the emotional turmoil that tears the person apart for it to be considered true heartbreak.
Once you have written the scene, reread and see if the emotions come through. If not, then edit making sure that the scene has emotional viability.
Have fun with this one!