Why am I sad over my ex boyfriend graduating?

Anonymous
I am sad because my ex boyfriend is graduating college? advice?

Please do not judge me or be mean. I am not the only one who cares and possibly love their ex.I graduated from college two years ago. We are not together and we do not speak, but I think I am sad because I can not be with him as his girlfriend. He broke up with me before he went to college and said how he wanted to be with me in the future. I am just sad...and do not know why? advice please?
Updates
+1 y
The circumstances was going away to college (long distance relationship). He said he wanted focused on himself.
Why am I sad over my ex boyfriend graduating?
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