Did I do something wrong?

A few weeks ago I transfer to a new school because my house is too far so my mom transfer me to that new school (right now we're studying online since there's too many covid cases). I thought I won't make any friend until this one day the teacher told us to get into pair and work together for the whole term but we didn't get to pick our partner. My teacher made me get into pair with this girl which we call he lina she's very quiet , sensitive and many more... At first I was texting her because there's a presentation (pair presentation) and surprisingly we have many similarities and we get along pretty well, we texted everyday I don't get along with people much I don't know how to start a conversation personally but I'm pretty confident at texting... And sometimes we even share secrets but everything didn't last that long... 2 weeks ago something happened I was texting her and suddenly there's some error with my phone I couldn't texted her back 2 hours later it's back to normal and I received a notification about her texting me why did you left me on read? I tried to explain everything to her about my phone being error and I thought everything was my fault she's still angry at me for about 1 weeks after that I couldn't receive any notification from her or should I say she didn't text me I thought she was busy so I didn't texted her back since I'm scared that I might bother her I'm scared that I will lost my friend again and again which is normal to me since I experience it many times after that she blocked me and texted me in my other social media saying sorry you're not active so I have to block you but she never told me the reason why? Do you block people who didn't text you for only 1 week? You said you're busy that's why I don't want to bother you. Did I do something wrong? Why didn't you texted me and explain to me what I did wrong? Why didn't you listen to my explanation first? 3 weeks after she blocked me she texted me using telegram (she blocked me on snapchat) I thought she forgave me for something I haven't done but she's just using me to help her with the presentation which I have to make it by myself (it supposed to be pair work) I realized that all her kindness and sweetness are just an act for me to become a tool for her , she never thought of me as a friend. And that's not the end yet... But I still don't understand wh can't she just tell me why? What's the reason? Did I do something wrong? If I do then I'm sorry I didn't mean to hurt anyone I don't want to make anyone suffer like I do.