So I was waiting to catch the bus to the SPAM when this girl (7) came up and asked me what bus she could catch to the SPAM. Being an opportunist, I offered to take her there as I was going as well and she agreed. We caught the bus together and i used a few negs and DHV's to keep interested on the 20 minutes bus ride and she responded really well

!. we went out, had lunch, shopped a bit and a generally awesome insta-date. we caught the bus home, exchanged numbers and went our separate ways. Here is where it gets confusing...
Later that SAME day (around 10pm) she asked to meet up as all her friends were out (she was living on campus) so i agreed but gave a FTC saying it could only be quick and that i wasn't sure. we met up and walked to the beach where conversation was good and i started to escalate kino as well,holding hands, linking arms etc etc..
we sat on the beach for a bit and she started to talk about her life in Darwin before she moved down here. i was bored but listening and she thought i was interested. we then went for a walk and she began to tell me about all the boyfriends she'd had in Darwin, an obvious shit test, so i just responded with the stories of my girlfriends and luckily, it was all good.
a few more dates like this happened (luckily) but much the same boring scene (her only being 17 for a few more days) as we couldn't go to bars and stuff.
I then asked her out on a proper date but due to some complications, it rained and it didn't go exactly to plan. despite my best effort to keep my cool she started talking this picture of her and some boy and i just lost it. when i lose it, i just go silent and untalkative. she got really pissed at that and we walked back home for about two km's without saying a word to each other. i said bye and she didn't say anything so she was obviously fucking angry. After that I cut my losses and decided to move on... for about a week... On her birthday (which i had completely forgot) i was out clubbing and managed to see her with one of her girlfriends. she called me over to my surprise and was super close trying to kiss me on the cheek but confused as i was (and not wanting to play easy to get) i was reluctant. eventually though i gave in and her friend took snapchat photos of us kissing and i was just living in the moment..
i left saying i had to find my friends and she was texting me that whole night asking where i was and calling me and shit.
next morning (i didn't f-close) no replies no nothing. two days later now no texts or calls or anything from here :/..
what do you guys think i should do? try and reinitiate contact now that she's 18? ignore and move on? help would be much much appreciated

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pups