I don't see it as you being selfish. Based on other LBH's threads, I believe it is a normal transition you experience when you finally began to move forward and then WAW shows interest. She had you in a bad place. You had isolated yourself from the rest of the world. I think it took courage for you to reach out and make new friends. It also seems to have been very good for your self-esteem.
She isn't just jealous over another female, but she is jealous of you making any life apart from her. I am very concerned she will try to "tag" you. Expect her to throw herself at you (sexually), and if you have sex with her, then she'll walk away knowing she still has her name branded all over you. It's sort of a power play to see that she's still in control of your life. If you succumb to her advances and have sex with her, she will not be very interested for very long. Just long enough to know she has grabbed you back out of the world and pulled you back to her dark, isolated corner.
Loving a person does not mean that you have to live with them. Telling her that you would have a lot to think over, is the exact answer to give.
After taking her to dinner, I think she will start the whole texting again. Don't become a slave to that, please, not after working so hard to over-come.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!