You are a grown up so forget about people putting thoughts into your head; you aren't a gullible kid and what would your T have to gain from doing so in the first place?

"You're young, you could. . ." is just sounding you out. She asked/was making sure of, "but you don't want to leave your marriage, do you?" and that you weren't staying just because you didn't "think" you could leave or had not seriously considered it. You did not play along with the make believe, the if-I-weren't-married-I-could. . . daydream. I might have played, not doing so seems a little defensive to me; as if thinking about alternatives could make them happen (or as if other people could make them happen to you by putting the thought into your head).

Other people are not here to meet our needs. That's our job, getting our meets met. If your needs are not being met, and you think your husband should be meeting them and he is not, the only choice for you is to find someone else who you think will, yes? We can't "make" other people do anything. I don't know what "needs" you are referring to; economic, sexual, emotional, etc. . . but if you are not meeting them/getting them met and you stick around trying to meet/get them met in the same way, what happens? You become stuck and/or depressed.

So what am I saying (probably badly, if not too baldly, I am not trying to hurt your feelings or upset you)? Our and other people's thoughts are not actions. Daydreaming about "when I'm rich. . .", "when my prince comes. . .", "I am young enough; if I weren't married to John I could. . ." cannot make those things happen (or we would have all become millionaires a long time ago from winning the lottery :-) but they can get our creative juices going so we can see different perspectives, one's other than the one's that are plaguing us now. It is a way to look at possibilities. So many people have been frightened or hurt so are afraid of daydreaming, "when I'm rich" reminds them that they are not and so they stop instead of finishing the thought. "When I am rich, I will buy myself ten years of therapy." That completed thought helps me see what I really want. It's the being rich, but therapy. But I have trouble with fantasizing, seeing further than right this second, so I miss information about myself and what I want and thus, cannot help myself get it.

"I am young enough; if I weren't married to John I could travel to Spain."
"I am young enough; if I weren't married to John I could pursue a degree in Art History and work at a museum."
"I am young enough; if I weren't married to John I could climb Mount Everest."

Completing the sentence allows us to not only look at what we really want but then try to figure out how to get it, even though we are married to John! It is easy to say, "John is not meeting my needs" but do we know our true needs and desires? If not married to John, what could happen? Who would I be (who am I other than John's wife, in other words)?