 If you liked
Byousoku 5 Centimeter
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 ...then you might like
Clannad: Mou Hitotsu no Sekai, Tomoyo-hen
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If you like animes where the main focus is love and relationships between characters, and all the emotions that come from it, then you will like these two shows. Both deal with a lot of powerful dramatic themes, such as sorrow and nostalgia. They deal mostly with being separated from the person you love/care about, and how that can affect your life. During the course of the show you might get attached to the characters and really experience their struggle and their pain. Plus, you can really relate to the characters if you have been through something similar (and perhaps even if you have not).
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Like the previous person said, both animes display relationships that break up and try and move on. Something like that. ^^ I felt like I was watching a Clannad version of 5cm per second.