I was in a 3 year long relationship with a girl I first met as a client. She only did this part time (like 2 days a week and 2-3 bookings a day). We even lived together for a while and I probably would've married her one day if we hadn't broken up because I loved her deeply.
When we started dating she was still doing it, and it didn't bother me because I was the one she would go home with, and I was the one who didn't have to pay to be with her. In some ways I found it kinda ego boosting that others would shell out hundred+ to just spend an hour with her while I could spend as much time with her as I wanted. I just tried to be supportive of whatever she wanted to do.
She eventually stopped but for different reasons, not because we got into a relationship. But even if she hadn't, it wouldn't have affected me...as long as she had some plan. What I mean by that is as long as she had a goal in her mind i.e. "I'll earn X amount of money so that I have enough to do Y, and that would allow me to pursue Z" that kind of stuff shows some sort of ambition, focus, and long term thinking beyond just here and now. Along with giving you an idea that the person can commit to something and I think that's an important factor in any relationship. And it's not even about the job tbh, I'd get similar sort of positive feeling if she was still working and was one of those escorts who go full businesswoman in how they run things (not businesslike in meets mind you, but in how they organise and approach this job), because again it shows an organised and focused attitude towards life.
I guess the point I'm trying to make, is that the job can take a toll on the mind and not everyone is suitable for it. Let alone be suitable to do the job and have a functioning long term relationship, you require an incredible amount of emotional maturity and strength of character from both sides to have that, and as such those that do will probably have a very deep and successful relationship regardless of whether she is still working or not. But if there are any insecurities etc, or lack of communication etc then over time it's bound to fail as what will start off as minor annoyance will blow up to something big later.
Mine failed but not for the above reason, it was to do with her own personal issues and she had to leave the country to resolve that, which led to the breakup. But I had some of the loveliest time with her and some amazing memories that I will always keep with me.