Damn! It's not like he found them in bed or anything. And even then, killing would not be an option. I don't understand why men come home to find their wives in bed with another man and beat the crap out of the man. SHE had a 50% participation rate there, too, didn't she? This is an extreme case of jealousy.
I have known women to be with jealous men and the man picks and chooses her friends, if she can have any at all. Sometimes the jealous spouse will forbid his/her mate to even get together or talk with family members. They get interrogated anytime they go to the store or anywhere and are delayed coming home in what the jealous spouse feels is an appropriate time frame. It could be a living hell. Right after high school, a girl I went to school with got involved with a jealous man. He took the license plates off her car when he left the house and they had deadbolt locks that you need a key from the inside and the outside (a nice safety feature if there's lots of windows by your entry doors) and he'd lock her in the house when he left and took the keys. Not surprisingly, she finally was able to extricate herself from him and joined a religious cult.
I would not tolerate an extremely jealous man. ESPECIALLY if he has no reason to be jealous. And I am not a cheater, so, no problem, right?