girlfriendy
A girl who straightens your tie or fixes your hair or goes out of her way to make your day better without wanting anything from you is acting girlfriendy. She doesn't have an agenda but to others, her arm around your neck or the way she leans into your conversation makes her look like a girlfriend.

You don't have a crushon her but it's crossed your mind.
Her ability to bring out the best in him and boost his confidence was downright girlfriendy.