I'm not sure that you should 'pretend', exactly, but you need to sort out what she really wants and thinks and not just allow her to assume that you are hanging around waiting for her ~ while she's off with other lads.
And ask yourself what you really want & how you really feel ~ about her and about what has happened.
If you really want her back and she really still loves you, then this might be great; but you need to be sure of her feelings and your own.
