1) potentially there couldve been virus present in the little scabs although the valtrex had been taken for days and at a high dose?
Yes, I would agree that the antiviral would have a very good impact on viral shedding, even with the scabs.
2) ***But was there also a possibility that I wasn’t contagious anymore because of the high dose??***
3) he’s not showing symptoms almost 20 days later so chances are he’s ok?
If he has no symptoms 20 days later, that’s a very good sign. Most people who acquire herpes show symptoms within 2 to 10 days if they are going to display symptoms. Not everyone who requires herpes shows symptoms however.