I have my fiancee in Madison County Jail, here in Nebraska, is it bad that at times when I go see him, I get accused of cheating on him when I'm not and I have been keeping to myself more than anything else.

Yes, this is a normal, typical experience that most women go through in riding out a sentence with an inmate you love. They have nothing but time to think about all the possibilities that are happening on the outside. Inmates create a "science fiction novel" in their head and dump all that on you, either on the phone or at the visitation. There is nothing you can do but maintain your innocence. This is the kind of thing that makes the relationship difficult to keep healthy during incarceration.