I would give less attention. Walk away if you only get spoon fed attention from her. Let her know in no uncertain terms how you feel about it. Find someone else that makes you a priority. Stand up for yourself, women like guys that have a spine. Make massive self improvements to yourself physically and mentally if she notices and gravitates more to you, great if not let her go, no one is worth being treated like second class goods.
Start looking for another girl. Either your dating and making her less of a priority for you makes her jealous enough to force her to make her move, and claim you as her man, or you move on and forget about her when you finally find a woman that appreciates you. I don't believe there is a better way to handle this.
i have no tips on that but if she can't have you as a main guy and needs other guys she isn't really ready for anything serious i would move on till you find what you like. why go crazy and confused over this girl despite the feelings you and her have?