My husband and I have been together for 17 years, since we were 15.
There have been times when we don't seem to "connect" very well. Neither of us has had affairs but that's not to say we didn't feel like walking out at one point or another. But we made commitments to each other and that's not an option, never has been, even before we got married (in year 13).
We just worked through it. Times get like that in every marriage, nobody is bullet proof. You need to come together and make the effort to fix it. Thinking back to year 7, that was actually a very good year for us. Year 6 was probably the worst. He was working in a job he hated, we just moved away from our home town and I felt isolated. We fought often (or didn't talk at all), but we didn't want anyone else, we just wanted the other to understand what we were going through. Living common-law with 2 babies forced us to get our crap together because it would have been so easy for one to leave.
Years 12-17 so far, have been the best *Touch wood* It keeps getting better and better. Sure we have an off week every now and then but if we could make it through year 6 everything else is a cake walk. As soon as you see it slipping you put in the extra effort and hope it's mutual. If you catch it quick enough it's like a hiccup.
Happily married to my high school sweetheart.