We cannot feel both of these differnent pairs of emotions about the same target at the same time. These pairs of emotions are exclusive.
Hatred excludes forgiveness and forgiveness excludes hatred
Apathy excludes love and love excludes apathy.
Amusement excludes anger and anger excludes amusement.
I cannot feel love and feel nothing for you at the same time.
I cannot forgive you and hate you at the same time.
I cannot feel amused by you and angry with you at the same time.
Now we can fluctuate from on to the other over time but in one moment we cannot feel both. A moment is as long as it takes to notice and name our emotional state.
Now non-exclusive emotions can stack. I can love you, hate you and be angry with you at the same time. I can hate you and feel amused by you at the same time.
More tenuous is the idea that fear and happiness are exclusive states. I cannot be afraid and happy at the same time? Seems to work. Happiness is fearless and fearfulness is unhappy.
Can anyone else think of any other exclusive states or when the above sets are not exclusive?