Huh. This is individual therapy, right? You're not in therapy with your whole family?

This would make me really mad. She's concerned about your family? They're not her client (I'm assuming!). YOU ARE. She needs to be on your side. I don't think that means pretending that you're making a good decision if she disagrees with it, but... it does mean trying to help you figure out what's best for you, without judging, and how to support you. Like LicketySplit said - empowering you to make good decisions.

I think beyond that, this is really stupid for a therapist. I don't know, but having an affair just seems like... such a superficial thing to focus on in therapy. Tons of people have affairs. It is what it is.

What I'd expect a good therapist to do is to really dive into the WHYs (without judging - that part is important, otherwise how can you be open enough to figure it out?). You know, are you cheating because you feel like your husband has emotionally abandoned you, or because you make impulsive decisions, or because you've met someone who has some crazy hypnotic power over you... etc. (I'm obviously totally making up those reasons as examples! )

I'd also think exploring the feelings that you talked about here - the fact that THIS is giving you a reason to get out of bed in the morning - might be fair game and important. But again, that should come from a place of trying to understand what's going on with you, not a place of judging, or blaming.

I think you deserve much better from your therapist. Is this all something you think you can talk through with her? How long have you been with her?

*Good luck* (and no judgements here)