<human>: So I've been at my current job for about 6 months now, I started here weighting 220lbs, dressing and looking like shit until... I met a co-worker and I immediately became infatuated with her beauty. I told my self that I will better my self for one day I will ask her out! So over the course of 6 months I've talked to her a little here and there to get to know a little bit about her. I think she realizes I like her because I try and strike up conversations to get to know her, but she doesn't seem interested in me (from my perspective anyway). 

Over the course of 6 months I've dropped down to 160lbs, I feel amazing and I've actually started to care about my self image. I have a better posture from working out, and I dress completely different with fitted clothes and an actual hair style. I feel like I owe this girl at least a huge "Thank you!" even if she isn't interested in me, but I feel like it might be a little awkward or create an awkward vibe if I did tell her.

I work in a different program than said co-worker, so we don't work together, but we see each other (sometimes) once or twice a week.

I'm no longer infatuated by this girl, but she is still gorgeous and I would love to get to know her better, but either way... -- I'm just looking for advice whether to tell this co-worker how much I'm grateful  for her existing and how it's bettered my life, or just keep it to my self and go about my life. (Advise on how to tell her this would also be awesome, I can't seem to put my appreciation into words)

Can you condense the text into a few key points?
<bot>: Became infatuated with co-worker, went from 220lb down to 160lbs. Should I tell her how her beauty has inspired me to lose weight and overall better my self?