Casey,
Perhaps consider doing some metta practice with her. As we intend loving kindness toward difficult connections, our mind becomes free from the type of agitation you’re experiencing. There are some great guided meditation practices on YouTube. Perhaps check out “ajahn brahm guided metta”.
If you still have romantic feelings for her, perhaps your caution is wise. They can sometimes stir up jealousy and resentment… that when expressed lead to guilt (and tears at the friendship). If you hold a strong intention of being especially gentle (and practice metta) then your heart will guide the way.
With warmth,
Matt