If your relationship is intact and you dream that its broken, it means you are being warned of the possibility of the end of your relationship.
If your relationship was broken some time ago, and you still dreamed of it, it means you might be having some nostalgia for the past.
If you had unresolved issues with the broken relationship, you might see recurring dreams about your past partner.
If you nurse hurt, anger or other emotions, these will gnaw at your emotional state. You should learn to let go, accept and heal. If you have difficulties trying to mend, you might like to consider seeking help to get over your challenges.