<human>: Been with my SO for five years and from day one I made it clear that I don't have marriage as a life intention.  She is OK with this and once in a while we talk about it to make sure we're on the the same page.  

Recently her mother is making more remarks than usual about her getting a ring.  It doesn't help all my SO's friends are getting married and popping out kids.  She's gone as far as suggesting my SO not travel with me and make herself more scarce.. so I realize how much I miss her.  You get the point.  She even started mentioned of other guys that she knows like her daughter and want marriage and kids.  This doesn't bother me because she doesn't say anything to me and ASAIK my SO tells her mother that it's not something that is on the table and drop it.

Now I know it's only a matter of time before someone makes a question or remark towards me.  I am pretty honest about my opinions and intentions.  Her family would most likely not appreciate these.  

I do not want to give some response that would lie about my intentions as this would just put more strain on her as time goes on and nothing happens.  

What would be the most tactful and respectful way to let that person know it's a personal issues and they should drop it respecting our decision, even if it is against what they were brought up expecting?

Please keep it to the topic of ways to respond if asked.  No looking for relationship advice or questioning anyone's intentions.

Can you condense the text into three sentences or less?
<bot>: SO's mother keeps asking when we're getting engaged and we have no intentions.  What's the most respectful way, for me M30, to reply to the question when it's eventually asked?