Ask her if she's seeing other people and ask yourself if you think she's 100% into you. I mean forget star signs, if you guys aren't hip-to-hip all the time where you know what she's up to, and she's like that, that's an indicator of someone who is dividing their attention between options. If a Cancer is into you, they will be 100. Maybe you guys are just superficial and you're hoping for reassuring responses here? Be real with yourself, man.