During intercourse my partner is sometimes dry on the outside and this last time I did not use ky jelly and ended up with a few cuts / abrasions on my penis shaft it has been two weeks and it has healed a little but not fully and is still sore to touch I also have diabetes which I think is slowing the healing process what is your advice to speed up the healing process/ thanks in advance

Keep as clean and dry as possible, and air yourself out a lot (naked). Air helps skin heal. You don't have any real options for fast healing as a diabetic.
A diabetic needs to be 100% immersed in a healthy diet and lifestyle, regardless of insulin.