I don't know what to do

I've been friends with this girl for a while and we started getting really close. We'd be very comfortable around each other and she became very touchy with me and complimented me and my body a lot. She was also around very often, we had lots of sleepovers where we stayed up really late which she told me she doesn't do with her other friends but with me it's different and she wants to stay up as long as possible. She also said she'd wanna spend the whole winter/1 month of summer break with me. We have a lot same interests and I started crushing on her. I was very unsure if she likes me back or not. I'm only out to her and my best friend. I asked my best friend about it and she said she might like me back after I described her behavior in even more detail than here. This year she was going to Scotland at the beginning of summer and before her trip I actually confessed to her. She rejected me and said she is actually straight. I was hurt and scared that I've ruined our friendship like this. She said we can still be friends but I feel like we'll never be that close again and I just feel like shit. That day I confessed we were supposed to actually meet but didn't since something came up for her and we just couldn't. She promised we'll see each other when she's back from Scotland and possibly have another sleepover. I was okay with that. We texted as normal but recently she actually went back from Scotland and she isn't replying to me. She left me on read and yesterday she didn't even read. I'm scared she actually changed her mind and doesn't wanna be friends with me anymore. She replies to my other friends as normal and idk I'm just kinda scared.