First step:

examine your own feelings and be honest with yourself.

Next step:

talk to her. If neither of you have feelings for each other, it’s likely that things can probably go on as before. But if this has awoken some emotions for either one of you, you need to discuss this and decide what to do. Can you go on living with each other if the feelings aren’t mutual?

It’s helpful to set some boundaries for your relationship. And make sure you take each other’s feelings into consideration.