He was confident, strong and aggressive.
He didn’t care that she was married, or that you were standing right there.
As he told your wife exactly what he planned to do to her later that night, she couldn’t hide her excitement.
Recalculation Required
In your marriage, it is understood by both your wife and you that her sexual pleasure takes complete priority over yours. So even though it has been months since the last time she let you have sex with her, you didn’t have to think about it very long to say that she should have sex with her boyfriend tonight instead of with you.
I don’t know why but for some reason hearing people refer to my penis as small or tiny or little just drives me wild.
She wanted to sleep the night with him, or what she told you get fucked by him all night. You may have convinced yourself, "Yeah, they will just fuck all night then she will come home to me". The fact is typically humans don't want to spend the night in bed with people they don't care about. There has to be at least some connection. Like when you first start dating, figuring out where you want to take the relationship.
For them that first night brought them closer, it fueled their connection. She loved how he fucked her, she also loved how he made her laugh, how he held her close in his arms, how he kissed her. She loved waking up next to him as the sun came up. Spending the morning with him. When you agreed to her having overnights. You may not have known it until now but you agreed for her to start having more emotional relationships with other men. Even falling in love with another man.