I'm going to accuse my boyfriend of cheating with another woman.
Is there a reason you think he's cheating on you?
No, but maybe he'll admit to something if I accuse him.
If you don't have any evidence that he is cheating then you shouldn't make that accusation. It sounds like you need to develop the trust in this relationship.
I think I'll make an accusation anyway.
Accusing someone of cheating without proof seems like a good way to end a relationship. How would you feel if he accused you of cheating?