Have you heard of a "hymen"? Do you recall hearing that this may be torn during intercourse? That this may lead to bleeding?
Now, how often do you hear of women seeking medical treatment for this condition?
All this just to get a perspective on the matter. To some extent, the frænulum may be viewed in the same manner as the hymen; it is occasionally torn during intercourse (to say nothing of what happens to the hymen during childbirth!), it may bleed, it may
on occasion require medical attention because of persistent or recurrent bleeding but it is essentially, a minor and generally self-limiting mishap of unaccustomed use of the genitals for their primary purpose.
What to do? Just what you would expect the young lady to do - give it a few days to heal, then be careful
with it (however you interpret that) until you are sure it will not happen again (or have figured out that you will take the risk anyway because as you say, it bled but - it stopped)
. The area is as it were, designed
to heal from such mishaps and does so quite quickly. Sometimes
it may remain tender for a while or re-tear to a lesser degree.
Is the damage of significance? Well, personally I do not think so. It is true that the frænulum has something to do with sensation in the penis, but I do not believe it has any more sensory nerves than any other area, and likely less
because it is a mid-line structure. The sensitivity it contributes is mainly by conveying movement of the foreskin, to the sensitive area around the urethral meatus ("pee-hole"), if it tears, it was probably too tight and will do just as well torn!
You may then note that I generally advise people against
surgery for a tight frænulum, and I do, but not too vehemently. This is because I feel that it can if necessary be stretched - though this does
require some patience - to "fit" as it were, and I prefer that people should benefit by solving problems by their own enterprise.