In reply to Removed User:
I have quite a similar situation to you; I often climb with my mum belaying me, and she doesn't climb. To clean, I'll abseil. To retrieve the rope, I'll either make the system retrievable, or on short crags, such as grit, I'll just go and get it afterwards. It can be an absolute pain in the arse, but it means I can get out onto rock with relative ease.
Alternatively, you could tow up a static line on your first route, and use that to abseil off and clean. Once you've done that, you climb your next route, and move the static line over. You could alternatively persuade your girlfriend to jumar up the rope behind you.
Beware, your belayer will likely get immensely bored.