Never be friends with a woman if your interest is romantic. A lot of times the romantic interest will fade and then you don't care anymore, and you can be friends or not be friends, whatever. As long as you still have romantic interest though, not friends. If she is asking you to hang out as friends tell her you're not interested in being just friends and if she changes her mind to give you a call, then leave it at that and go about your life.
Women can tell if you have romantic interest easily, and if you have romantic interest but agree to be friends she will just have pity on you, and pity never turns into romance.