Wife Gives Male Friend Kiss on Lips – Leo and Rebecca Buzz Question

Leo and Rebecca BUZZ QUESTION...Hey guys, my wife has a MALE friend she has had all her life. He comes into town all the time and every time they greet..they give a kiss peck on the cheek. I've never had a problem with it. This last weekend though, I noticed she went into him and gave him a KISS ON THE LIPS! WTH??? It took me back and I want your vibe on it before I bring it up...if I do bring it up. Thanks!