Dreaming that your loved one has committed adultery can mean:
You're feeling insecure about your ability to hold their interest
You're afraid of the idea of them cheating on you
You're feeling jealous about your loved one devoting time or attention to something other than you (work, a hobby, watching TV, using the computer, etc.)—having nothing to do with any actual adultery
You're feeling that you do not trust God (you feel God has betrayed you), or you do not trust yourself (you feel you have betrayed yourself)
Possible dream symbol meanings in the dream dictionary are suggested. No "standard meanings" exist because dream meaning is subjective and specific to the dreamer.