Please help, am I too nice to my ex?

I really need your guys help on this.. OK so I met my ex and I had no interest in him what so ever (which is why he was so keen on me) were talking I rejected him 5 times and finally gave into a date... while we were together and broken up he said I meant more to him then any other girl he'd been with (this is a lot for him because it is a player). Anyway he started acting really distant and question the relationship after a few months so we broke up because I said he makes up his mind and he couldn't. But because I was a bitch before we went out I was really nice when we were together and I think he got bored with me being overly nice... so my question now do I stay overly nice when I see him (twice a week) or so I have a bit of an attitude to make him want me back!?
Please help, am I too nice to my ex?
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