The most common emotion experienced in dreams is anxiety.
Negative emotions are more common than positive feelings.
Next time, before you go to sleep try to imagine a new ending to your dream (you and your boyfriend are together happy, not breaking up)
If you wake up from a dream like that, you gonna feel empowered.
Rehearsing positive changes to troubling dreams results in new dream endings.
You may need to rehearse the new ending several times before you see change in your dreams.
Can you recognize some conflicts in your life?
Do you feel some kind of worry for your relationship in your daylife?