This could be looked at a few different ways. Almost going to bed with someone certainly isn't grounds for divorce or even wanting to, but then ultimately, what people don't seem to want to come to terms with about a relationship these days is the fact that it's about a choice, a commitment, it's not as if you will just magically stop noticing other people, although that will be easier for most during the honeymoon phase. There's going to come a point in time when most likely there is going to be some form of temptation. That's pretty normal, and I would say if it's something as simple as you want to sleep with someone else, but you don't plan on ever acting on it, your partner maybe need not even know. What good does that do? Is that helping them, or your own conscience? On the other hand, if you are constantly being tempted by the same person. maybe then either make your partner aware, or do what you have to do to eliminate your contact with the person who is tempting you. Easier said than done, sometimes. I just feel like once you involve your spouse, it could make it even more complicated because now they feel like you actively want to cheat, and while their knowing might make it less likely to happen, who wants to be in your partner's shoes on this one, always knowing someone else is on your mind? Now. if you actually do cheat, that obviously is a game changer. I'd say it's only grounds for a separation(and divorce)if you actually do cheat. or you almost cheat more than once. I think part of the reason marriages end so often these days is they base the whole relationship on the honeymoon period, not being realistic that ultimately you are choosing one another, and these initial feelings of bliss naturally are going to go somewhat go by the wayside.Every relationship seems based on movie characters, or the actors themselves.
I will also say that having the desire to cheat could also speak on bigger issues in your relationship, and it's not necessarily just a physical one. This is where I think communication is a good idea, but possibly not directly coming out with, "I almost slept with this person, or wanted to sleep with that person". Like I said, it's tricky because these natural instincts don't just die when we agree to dedicate our lives to one person. but that's where the "I choose this person" comes into play. Not "as long as I feel this way" about said person. We should all really be raised with this realistic approach of relationships growing up, rather than the Hollywood examples dictating how our relationships should play out. Being a united force, and realizing you make the choice, both of you to be with just the other person, as long as you are being respected, not physically or emotionally abused. In any case, running to another where the grass will most definitely seem greener at first is not the answer. On this note, though, I also think people should take a little more time to decide on actually getting married, but not too long, or there really might not be too many marriages.
