It's possible. There aren't any odds I can give you, though. It depends on how much virus was still present on your skin, if any, or if you were still shedding the virus (this is known as asymptomatic viral shedding), and we have no way of knowing that. It varies from person to person.
Does he have hsv1? I'm assuming you've been kissing him, and he hasn't gotten oral hsv1? He should get a type specific IgG blood test now. If it's positive for type 1, he already has it, and can't get it again. His antibodies will help prevent him from getting it again in a different location.
If it's negative now, he can test again at 4 months to see if he got it.
I wouldn't overly worry about it, honestly. If you've been kissing him throughout your relationship and he hasn't gotten oral hsv1, he may already have it. Over 50% of the adult population has it, and 90% will never have symptoms.