Become a wallaby....
Clingy, needy, always calling her every couple of minutes, keep on asking her what is wrong, be jealous, Write her 'like' notes, never lead her, always ask her what she wants, never make a decision, lose your hygiene.
Everything we tell everyone not to do.
How do you change your patterns so she does not notice. Tell her you have never met a girl that makes you feel this way. Start slow, progress to the above within two weeks.
You will see how quickly she losses interest.
If none of this works (it should but wussies still get married) start becoming really jealous. Accuse her of cheating on you and wanting something else. Then tell her you do not want to see her anymore because you do not trust her........
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Recommended reading list.
Double Your Dating by DD
(This will work on your inner game)
http://www.freewebs.com/xfman/
(This will work on your outer game)