In the event your man has cheated and you have chose to offer him another possibility, you have to forgive and move forward straight away. You should not obsess on how great she was a student in bed or if perhaps she performed this or that to him, and do not ask him any such questions. The solutions will damage you and create more insecurity.
Do ask him exactly why he performed what he did and ascertain with each other how you can be stronger your knowledge.
