Most likely assuming his wife cheated or something and then told him about it when they were both drunk and then he got angry. He probably was concealed carrying at the time when he went over so that's why he had the gun on him. The Glock 19 is one of the most popular concealed carry weapons. She called the cops not knowing what would happen, not knowing the repercussions of a domestic violence charge. The guy looks like he comes from a loving family and doesn't look like a bad guy. Hasn't even had a speeding ticket before this. One day you're young and dumb living your life, and the next you're a felon. If he's convicted he'll be kicked out of the military and in jail for awhile. Both of them shouldn't have talked to the police at all. Honestly hope for the best for him on his way to rebuilding a shattered life. Really hope he doesn't have kids, because he'll have no way of supporting them with a record like that.