No, it's perfectly reasonable to feel the way you do. It is noteworthy, though, to accept that your bride has been honest with you. That's an important aspect, since the affair is a breach of trust, and probably causes you to question your wife's integrity.
There is an excellent book available, called Every Woman's Desire, written by Stephen Arterburn and Fred Stoecker. It basically advises us that we are to honor our wives the way Jesus Christ honors his own bride, the church.
Often, Christian marriages have their struggles because both spouses can take a very simplistic interpretation of 1Corinthians, expecting the wife to be submissive and the husband to break all the ties. We must be spiritual leaders of our families by being good servants, as Jesus Christ, the son of God, served us by dying for our sins. It's a pretty high standard, but even human attempts at it can strengthen a marriage considerably. Christians are not immune to sin.
It's a good read, and had I known the material before I was married, I might have been able to avoid some of the problems my wife and I are experiencing at the moment.
I pray that God gives us a chance to atone to one another, that he softens her heart while she is deployed, and that she might forgive me for taking her for granted. Maybe in war torn Bosnia, she can reestablish her own relationship with Jesus Christ, and realize that it is Satan himself who breaks up families. Selfishness and the false promise of immediate happiness are his tools.
I'll pray for you, for strength, patience and guidance.
God Bless!