I was going to ask the same question. Why can't you be of service to others at the same time as having a relationship with your partner?? When you're in a committed relationship, you don't HAVE to spend 24/7 with one another. People DO go to work, etc., and they're not together. Why couldn't you take a couple of nights a week and do what it is you do? Is she that insecure that she couldn't handle that?
If you can't do both, you're going to be a very lonely person later on in life.

Best of luck. Hugs, Lee