One final text to the ex? Help me?

My ex broke up with me about 5 weeks ago out of the blue.. She said her heart wasn't in it any more that's all the excuse I got. I'm literally shattered from endless sleepless nights and wanting her back. I've tried not to contact her but I bumped into her in the street last week.. She was normal chatty, funny affectionate and suggested hanging out. I followed it up and asked if I could take her for a drink to which she said it was a bad idea and then stopped replying. Part of me wants to send one final text telling her that it's a shame we couldn't have sat down worked through things to create something new and better as I do feel we have something special and wish her all the best for the future. Is this a bad idea? Am I wasting my time? I know I need to move on and you can't revive a dying horse but I want her back so badly.
One final text to the ex? Help me?
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