What's the best way to move on?

I just finished a relationship which I deeply fond of. I cut the person off because I see no future and many down side of being together, even though there are also too many up side of being together. Now, I could feel the loss of up side is eating me and making me weak and emotional. But I know going back with him is not a rational decision.
So, my question is, what should I do to move on?
What I can think of is 1. meeting someone new, 2. staying with friends for most of time when free, 3. get work taking most of my time.
I tried all of them, not working. From this experience, I realize myself as a rational romantic which seems full of contradiction. Empathy or constructive suggestions are all welcome. Thanks.

What's the best way to move on?
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