L.U.
Meghan,
I agreed with Sophia P, and Nan D., you don't want to wreck his marriage. And yelling good bye from the next room is a great way to let him know you don't want to do that again. Say it with a tone that he will understand what you mean.
I liked the wording she used...letting him know that he was "out of line" He's Married. Kids pick up on things, you don't want them learning that it's OK for married people to kiss with that level of intimate connection on a regular basis. Once was probably fine...they probably didn't notice, but repetition could lead to much more. He got an inch, don't give him another, or it could develop into a mile. On the flip side, if it is more, it wouldn't be so crazy for a woman to fall in love with her x-hubby's brother. Be adults about it...be honest about feelings before things get anywhere near sneaky. Let it rest for now. If he keeps giving you the eyes, and making you feel uncomfortable, talk to him in private and tell him that was not OK and he needs to stop stirring about it, and move on. It may have given him a major fantasy to think about and be tough for him to shake off. Be strong. Good Luck.