You're being super afc and acting like a teen with this girl. After your date you should have pulled the car over some where dark and escalated. Given her first kiss, her first ass grab haha what ever lol. Also don't worry about her acting all flakey and odd she's a HS girl and even if she likes you probably scared or just weird. Just tell her when you're seeing her and always be escalating. Make sure you're getting your **** sucked atleast by the third date and get over your oneitus baby mentality for her. It's great you really like her so don't screw it up by not being aggressive, not escalating, and by giving af. You need to not give af and enjoy her and also be chasing other chicks.