Search Results: going down on eachother

I started talking to this girl for about 4 months now we aren't really dating but we were talking a lot and we both liked eachother because we both admitted it, and I think it's kind of dieing down. She used to always text me first and text back a lot. Now she usually text me when she needs help with homework. And she rarely text me to see how I am doing. But whenever I feel like I am about to quit on her I just can't cause whenever I see her it just gives me the moral to keep trying. Anyways she told me she is going to Hawaii with her family this weekend, but since the false alarm incident I don't think she's going. But she's went to Las Vegas. I have Snapchat and under the mural friends I ended up adding her ex on accident but eventually she told me that it was her ex. But I go on snap maps and I end up finding out that she is with her ex hanging out in Las Vegas first I saw them in the same area then I saw them right by each other. Then after that they BOTH went Ghost mode which is you can't see either of them on Snapchat maps, later they posted shoe selfies on their stories (Basically selfies of you both wearing shoes side by side). When I saw this my heart literally dropped but I was not too surprised because I predicted it but my heart still dropped. I am not sure if they are just catching up with each other or if they got back together. But anyways she comes back out here next week and I want to change because when I asked her out she said I am "confusing, and to just take it slow". It's hard for me because whenever I feel like I should give up on her she ends up doing something small that turns out nice. When she comes back next week I want to be a totally different person then what she remembered. Because I am shy a lot and people always tell me I am quiet. I want to start over from scratch and be the guy she wants. What should I do?