This is a longshot but I have been searching for this lost book forever. I read it in the late 1970s It was a teen/summer romance about a first love, possibly Scholastic book or Arrow Book Club. I think it was set at the beach and the cover was pink with maybe a beach sunset. At the end, the girl and boy are not together. Thank you for any clues on this!
Lost Classics of Teen Lit: Name That Book! 
Maybe My First Love and Other Disasters? It’s been republished multiple times over the years with different covers but the first edition is from 1979
https://www.goodreads.com/book/show/2465444
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Thank you for that suggestion! I don’t think that’s it, although I do remember this book. The book I’m thinking of was definitely an older teen.
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Seventeenth Summer by Maureen Daly?
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Could it have been “Small Losses?” That was first published in Seventeen Magazine but I think might have wound in an anthology later.
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