What should I do?

So let me give some backstory to my problem. I'm 17 and in high school now. Since about 2014 I've had this thing for a girl I went to school with. She is everything I've ever wanted. My feelings culminated around 2015, where I could not talk to her properly, I'd have this feeling I can only presume is love.

So it's safe to say I was devastated when she found a boyfriend. He was a typical douche so I knew it wouldn't last long. I was right. It still hurt me pretty bad though, which made me stop talking to her for about a year. It was only in October of 2016, I think, that I started to talk to her again because we met outside during a mutual friend's birthday party. By then I had cooled off and we started to talk. Her friends teased her about us, and my friends did the same with me.It gave me a lot of confidence.

Up to 2016 I was a nobody. Fat, ugly and a huge a-hole. I decided to do a complete 180 and work on myself. So by the beginning of 2017 I am in love with myself and have a lot of people to call my friends. I actually enjoy looking at myself in the mirror and I wish the same for everyone.

It was January of 2017 when I decided to ask her out after all these years. It didn't go well and I was broken to say the least. Not because she rejected me, but because she ignored the message and answered a day later, after I called her out for it. I thought of her every night before I went to bed, her smile and laugh in particular. So I cut her off again, used all that hate to better myself even further, and for the first time ever started seeing other girls. From January until May of this year I have fooled around with five different girls. I say fooled around because I never felt the same with them like I did with her. I refused to kiss one just because I wanted her to be my first.

This all brings us to present day. We had an event at our school today and she and I were paired up on a group project, so I got an excuse to talk to her again. I knew it would happen, all those old feelings started coming back. I couldn't take my eyes of her and her damn laugh, just ughh. So now after 2000 words I guess I can ask the question of whether I should try to ask her out for a second time or not?

TL;DR: I was put into a school project with my first love that I haven't talked to in along time due to some bad blood in the past and still have feelings for. Should I ask her out a second time?

Sorry for the spelling, grammar, sentence construction and all that (English isn't my first language) If you have any questions about anything feel free to ask and I appreciate any and all help :)