I know this is going to sound unreal, but your situation is pretty much how things are done in my area. I know of 10 women off the top of my head who only ever dated one man each, married young, and stayed married to them. I don't believe these ladies have ever been unfaithful to their husbands. I have never heard or seen evidence of it, and trust me, in a small town- we know everything! In my area, I am abnormal as I am unmarried and most of my cohort married right out of high school.
Too many relationships diminish the meaning of Love.
My two cents...