Could my wife be fucking other men ?

My wife and I have been married for a few years now. Recently I’ve been having feelings about her fucking other men. I have a very tiny dick and we don’t have sex like we used to. Maybe twice a month if we’re lucky. I offered to buy her vibrators but she said she don’t need them and won’t used them. She mention one time that she only shaved her pussy completely bald when she was trying to find her a man and she kept it trimmed but the other day i noticed her pussy was smoothed. She goes into our room and spends anywhere from 30 mins to hours with the door shut. Does this sound alarming ?