Coming in terms with Past Friendships?

Lately I have been scrolling through texts of old high school friendships and acquaintances for some odd reason. I don’t really talk to any of them anymore but looking at the paragraphs we used to send each other makes me sentimental at times. Maybe it is that one online friend who eventually became dry, or the best friend that would not make time for me…but thanks to my newfound confidence I was able to let go and make new friends.

Is it normal to mourn past relationships though, especially if these same people don’t really care at all? Coming back home from my OOS college is tough; especially when I lost most high school friendships. Would it be weird to reach out even if they don’t respond regardless of circumstances?