I agree with Phreak. She broke up with you/left you.

The problem of her working for her ex is a really bad situation anyway.

I wouldn't have come up with what Phreak said about the bringing the personal issues to the workplace myself but he is 100% on target here. Even if it were appropriate to give her flowers now (which is questionable anyway - she left you!) it wouldn't be appropriate to do so in the workplace.

Considering she probably already has a hard time even being around you in the work place, I don't think she's being a heartless anything, but is extremely put on the spot by your bringing unwanted flowers to her. She is like a captive audience because she has to be there. I thin kit was quite unwise.

You need to let it go and if no where else, at least in the work place. She is now just an employee, treat her as such, not an ex lover or anything. Keep it professional or you may end up in a tougher situation than you are now.