I have been with my SO for 9 years. We have 3 kids. Lately he has been distant, on his phone alot more and messaging someone from work who 15 years younger, single, no kids. We spoke about it and he said nothing was going on, that they are just friends and I'm worrying about nothing. Things were getting better until I found something in his drawers. I found some matching underwear that he brought whilst we were on a weekend away together. They are love hearts and the words love. Boxers for him and matching bra and knickers. They are in a size small. I'm not a small amd he knows that and they are defo something i would never wear. He also had the package sent to his parents house and then hid it. How do I go about asking about this and Is here a reasonable explanation that I couldn't have thought of?