The best thing you can do when faced with an ex who doesn't want you back is to take the piss out of them. It's much more face saving than following them around like a puppy dog. Michaela and I once worked out how to categorise men in terms of food. Perhaps you could try your own version? It's highly cathartic.

The packet of biscuits man - you only meant to have one, but then you went back for another, and another, and before you knew it you'd eaten the whole packet.
The baked beans man - you just wanted a quick snack, but he followed you around for days afterwards.
The casserole man - keep him on the back burner for when you've got nothing else to eat
The chinese food man - you're hungry again two hours afterwards.
The meat and two veg man - it's very stable and dependable, but a bit boring.
The salad man - you know it's good for you, but it's just not appetising unless you cover it with extras.
The packet of crisps man - share him with your friends
The fondue man - everybody's had a dip in at some time or another.
The pasta man - lots of variety, but goes cold quickly.
The pizza man - delivered by somebody else, with no effort on your part.
The French restaurant man - food is great, but the waiters are rude.
The chocolate ice-cream man - Makes you feel better about yourself, but you'll be sick if you eat too much.
The kebab man - it seemed like such a good idea when you were drunk last night...
Leftovers man - it looked all sorry for itself sitting in the back of the fridge, and nobody else was going to eat it...
Escargot man - nobody else can believe you actually want to eat that.
Shellfish man - tasty when cooked right, but you never know when you're going to get a bad one.