Let's also imagine that you don't get everything you need from that relationship.
There is also many things you do get, that's why you stay together. But let's focus on that, what you don't get, for a while...
Here's a short list what kind of missings there may be:
- Approval (on things you would like to do- to even who you are)
- Attention (this is big, huge problem in many realtionships)
- Affection (as tenderness)
There is 3 big A's to handle.. But there's more to come... The question behind all of those important things missing, is obviously: WHY? Why are they missing. They were there, but now they're gone. Where? (Well, those questions you have to ask from yourself.. )
If your life is missing some of the big A's you probably find yourself in situations where you have also lack of sex. And missing big O's too.. =)
Lack of sex, drives people into cheating (there is also other reasons for that..) fighting and arguing about, well about everything. So what can you do? You cannot stay in a-sex mood for too long. You're going to snap sooner or later.
Humans need sex. They also need food and water. If you can't get it in your relationship, what then? Well, you maybe find someone who is capable of giving you what you need. Or you have to try multiply times to find someone worthy.
Question remains, if you cheat, if you find some one who gives you, let's say the sex you're lacking, do you now have to end your relationship with your spouse? Or can you just live with it?