Why don't you summon all the love and patience you never thought you have, and little by little, teach your girlfirend to ride a bike. It won't be easy, from your account, but when (not IF!) you succeed, she'll be grateful till the end of the world. And very, very happy. And healthy (all these will translate very positively to your situation).

You'll gain the most faithful, most fun person to ride with.

Even people very uncoordinated can learn to ride a bike, I guarantee you that. If you want to know how I can be so sure, feel free to pm me.