I was see a girl I work with, in the same office, within eye shot of each other. She got drunk one night and ended up getting with another engineer I work with and now they're seeing each other. I see her everyday, I see them both everyday and I still really like her and did hang out with her for a couple of months after but I've had to completely avoid talking to her because I know how much harder it would be if I did.
Its the hardest thing I've had to do and still hate it but I'm getting used to it and so can you.