So, just found pics of this girl my hubby messed around with...?

NO, you didn't over react. You found pics he had all this time & lead you to believe there was no one else when there was. He DOES owe you an explanation. Why did he have these pics a month after you moved in together. You asked him to come clean with you. He absolutely ignored your question. All he's done with you is double talk you & ans. your questions with questions. This is no way to have a logical conversation with anyone. The two of you need to sit down & have a serious talk. None of this double talk, none of this ignoring what you're asking. Don't accept the unacceptable with him. Say what you mean, mean what you say. Make sure you get out of him everything you want to know about. Tell him you've got to get things straightened out & NOW. When you do it if you want to write things down you want to ask, do it so you won't forget anything or get way laid & off the subject. You've got to get it out once & for all & get the truth out now. He's acting like it's all a big joke, but it's not. Tell him you both are going to come clean about anything either of you want to know...the best to you...:)