I’m 100% sure my dad is cheating on my mom

My dad has been wearing cologne to work and buying himself very expensive and sexy underwear for the past month or so. I’m 100% sure he is cheating on my mom and I never would have thought he would do this. He’s been wearing the same underwear from target his whole life. I’m also sure he would never treat another woman the way he treats my mom. I’m worried they will divorce and I will lose contact with him. Stay strong Mom