Welcome to HCM,
From your history it seems that you might have comparatively more severe injury
to your private parts as there is profuse bleeding.
As your Gynaec told go for stitch, otherwise if it heals after some time with the help of antibiotic and dressing, there are all chances of having painful scar due to un even healing scar leading to painful intercourse.
So it is advisable to go for stitches.
Ok and bye.