[Atelier TODO (Shiruko, TODO Kantoku)] School Mizugi to Polo Shirt o Kita... Omoide no Senpai | Wearing a School Swimsuit and a Polo Shirt... Memories of Seniors [English] [Penguin Piper]
Not saying the guy should try dating her again, but it's weird how he just pretended to not know her considering it doesn't seem they split on bad terms. You could argue the same for her, but we don't know whether she recognized him or not.
The real issue was his wishy-washy attitude toward their relationship, he admitted to wondering what it would have been like if they stayed together, but made no effort to try and stay in touch.
No letters, no messages on line, no phone calls, nothing.