How do I handle my first love moving on?

My first love/ high school sweetheart broke up randomly over the phone after over three years together. We were both within a year of graduating college at the time and I was going to move back to my home state so we could get married and move in together after a few more years of dating.

We were both each others first in nearly all things and we also started dating at such a special time of life which definitely heightens the emotions surrounding our relationship/breakup. I know its possible to fall in love more than once but the first time is well the first time so it feels like it something so special yet it feels that it meant nothing to her which definitely stings quite a bit after I gave my all for that relationship.

It's been 1.5 Years since the breakup so I have largely moved forward however, I found out yesterday she's been in a new relationship for a quite some time. That's a weird one to sit with. I have felt emotions that I haven't felt since the initial breakup and am so numb and sick. It just feels like I went above and beyond and ended up here and am so lost at this time. And its not because I want her back, I wouldn't take someone back who treats someone who loves them unconditionally as cold as she did with me, however there still are very real emotions and it hurts to see her move on so quickly especially considering we would be engaged and possibly married today had things not ended.

I do feel I know largely I just need to go out and win at everything in life and find a new beautiful relationship with an amazing girl and experience these emotions again. But I also have never navigated this before and it hurts much more than I could describe. There is a feeling that I will not fall in love that hard with someone again which is also scary.

Anyone who has experienced something similar how did you turn the corner and improve your life as a result of the motivation/pain? Anyone with advice in general is so greatly appreciated. Thank you in advance

How do I handle my first love moving on?
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