I had one ex who was incredibly jealous of me being in therapy. She believed she should be able to be my everything, and I shouldn't have to seek support outside of the relationship. I know she was incredibly insecure in herself, but also carried the negative view of therapy from her experiences growing up as the child of a (very judgemental and strict as a mom) PDoc... She believed only "really crazy people" went to therapy. I ended up stopping therapy for a while because it was easier to do than to have to deal with her anxiety around me going. I wasn;t particularly comfortable with the therapist I was seeing at the time anyway, and felt at a place to take a break.

My wife was a bit uncomfortable for a while because she is pretty insecure. She was worried T was telling me to drop her. Though she was also in therapy at the time we met, she wasn't getting much benefit from it (I believe it was mandated by her work, though not 100% sure). She has since learned more of why I'm in therapy, and really appreciates that I have extra support. She has also found a therapist herself whom she feels comfortable with. We've gone to couple's counseling recently, though it was more to tackle some traumatic stuff we went through together and how that effected us as a couple...

Transparency helped a lot with my wife, but not so much with my ex...