I have a gal who i haven't talked to in 3weeks i don't know how to apologise and need you guys to advice.

what is there to say!?!?!? walk up to her say ';IM SORRY PLEASE FORGIVE'; and bam its done and over.I have a gal who i haven't talked to in 3weeks i don't know how to apologise and need you guys to advice.
if you haven't talked to her in 3 weeks, you can't say you ';have a gal';