How do you cope with love loss and not being enough?

Anonymous
2 years ago my ex and I separated and this was a shock to me because I thought we loved each other, I was even planning on marriage some day. We lost our virginity together and experienced the world from late teens to early 20s. Then when she found out I needed to move to another state for college she broke up with me, no tears, no struggle to make things work, just... gone. this was a shock to me because even though I was broke and struggling with some things so was she, and we shared so many happy memories like picnics and going to amusement parks, and I would have died for her if I needed to. Then just 3 months after we broke up I found out she was already dating another guy and had moved on. So I guess to specify my questions, how is it so easy for people to move on and forget love, and how do I learn to love again without being afraid of her losing love for me like the first girl? All advice is appreciated.
How do you cope with love loss and not being enough?
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