Don't know what to believe any more

We been together 9 years and we just recently married 3 moths. My wife has been acting kind of strange not focusing on our relationship I thought been marry was supposed to be a great feeling.. Every time she takes showers she always wash her panty and uses the shower curtain pole to hung them up. some times she has 2 or 3 dry clean panties and once shes done taken a shower she wears one of them. On May 21(tuesday) we were supposed shower, but she did not wait she went ahead, by the time she finish I went in, as I was closing the shower curtain I noticed that her panty wasn't there where she normally places after been wash. I asked her what happened with your panty got lost in the way in. she did not reply and walk away second incident yesterday (Tuesday) she did the same thing her panty was missing and I questioned her about it she said that she has it ON... I told her that's insane she had 3 clean panties hanging on the pole & door why would you wear the same dirty underwear after finish taken a shower... ??? she didn't say much she went to laid down then I realize she did the same thing happened back in May 21 and I confronted her, she looked at me and said fine, then she took it off and tossed at me and yes same dirty panty's.. She claims that she did it caused she wanted to.. She didn't want to speak to me at all ... Help I'm confused. she doesn't wanna talk about it ... I don't wanna think worst .... she's having an affair help.

What strange behavior. Can you slither down and ask "help me understand your underwear routine?" when you ask this way, it's less confrontational.