I personally isolate because I need to rest. I can't handle 24/7 stimulation from outside sources, including relationships.

The truth is that MANY people....at the start of a relationship....expect to be attached at the hip to their new partner. And well, if your needs aren't compatible with their wants/needs....then they think that you don't like them, even if this couldn't be further than the truth.

Can you try talking to her and telling her that you need time to yourself? A good person will understand its not about them. If someone takes offense to it, kick them to the curb as they won't ever be able to understand the complexities of someone with MI struggles.