<human>: I've been married for about a year, and was dating my wife for the 3 years prior to that.  For full disclosure, I'm madly in love with my wife, but would be lying if I didn't admit that her sister is a looker.   My SIL is not a terrible person, but we're not super close either.  She can be pretty mean to her family at times, and we all have to work at getting along with her. 

This year over the holidays my sister in law was visiting, and the three of us smoked a bit of pot together (not something we ordinarily do).  I thought taking part in some pot would put us all at ease.  When we were smoking, I think that I was kind of leering over at her or something.  I remember feeling awkward at the time, but thought I had kept it to myself.  

Apparently not. Over facebook chat (who facebook chats?!), my SIL just initiated an awkward conversation with me where she wanted to confirm that she could just be friends with me, because that's what she liked about married men.  She said she liked how there were no ambiguities in her friendships with married men, and that was why she got along with them so well.  She asked to confirm that was our relationship over the course of the conversation, repeatedly. 

My question for you, /r/relationships: 
1) What can I do to not leer at her like this?  It's quite unseemly, and not who I think of myself as.
2) Do I owe my wife an apology, or should I never ever ever bring this up (leaning towards the latter, I suspect this would not be a fun conversation for her)?
3) Any other nuggets of unsolicited wisdom? I know /r/relationships is great for those :)

Can you give me the gist of the text in a nutshell?
<bot>: My attractive sister in law has implied that I may be hitting on her.  Worst part is that she may be right.  How can I not do this again?