They likely don’t know how to ask for intimacy (not JUST sex), or if they do ask, they don’t know how to do it in such a way that connects with the woman, which answers why do men lie and cheat.
So, the man then looks for a cheap substitute to soothe his needs and desires for intimacy.” Greg Griffin Pastoral Counselor
Cheating is the manifestation of unresolved issues not dealt with, a void that is unfulfilled, and the inability to fully commit to the relationship and his partner.
Husband cheating on wife is not something that happens. It is a choice that the husband has made. There is no justified explanation for why men cheat. Dr. Lawanda N. Evans Counselor
6. Men cheat due to selfishness
Such as: “Grass is greener,” feeling desired, the thrill of the conquest, feeling trapped, unhappiness, etc. Underneath all those reasons and others, it is pretty simple, selfishness.- the selfishness that hampers commitment, the integrity of character, and honoring another above self.” Sean Sears Pastoral Counselor
7. Men cheat due to lack of appreciation
“While there are numerous stated reasons, one theme that runs through them for men is the lack of appreciation and attention .
Many men feel they work hard for their families. They internalize their emotions, and can feel they have been doing much and not receiving enough in return. This explains why men cheat.
The affair offers the opportunity to receive admiration, approval, new attention, seeing themselves anew in someone else’s eyes.” Robert Taibbi Clinical social worker
8. Men seek love and attention
“There are a few reasons why do men cheat, 
but the one that sticks out for me is, men like attentiveness. In relationships, cheating rears its ugly head when there is a lack of feeling loved and appreciated.
Oftentimes, especially in our fast-paced rush, rush rush, society, couples get so busy that they forget to care for each other.
Conversations become centered on logistics, “who’s picking up the kids today,” “Don’t forget to sign the papers for the bank,” etc. Men, like the rest of us, seek love and attention.
If they feel ignored, bullied, or nagged at constantly, they will seek someone out who listens, stops and compliments them, and makes them feel good, as opposed to what they felt like with their own partner, a failure.
9. Men need their ego stroked
But because it’s based on external validation, the moment the new conquest complains about anything, the doubts are back with a vengeance, and he needs to look for a new conquest. This is why men cheat.
10. Men become disillusioned with their marriage
They thought that once they were married, life would be great. They would be together with their spouse and be able to talk all they wanted and have sex when they wanted, and live in an unencumbered world together.
However, they begin to do life together with work , financial responsibilities, and having children. All of a sudden, the pleasure is gone.
It appears that everything is about work and taking care of other people and their needs . What about “my needs!” This is why married men cheat. Men become jealous of those little ones in the house who are consuming all of their spouse’s time and energy.
She doesn’t seem to want or desire him anymore. All she does is take care of the kids, running everywhere with them and not paying attention to him.
It is because they begin to look elsewhere for that person who will give them what they need, both – attentiveness and sexual admiration. They are under the assumption that another person can and will meet their needs and make them happy.