Fever blister from sun burn...contagious?

So my entire life I've suffered from cold sores and fever blisters. Most commonly I get cold sores in the winter but I got a really bad sun burn on vacation even though I used spf 50. Well my lips got it the worst and I now have two huge fever blisters. I have always been told that they are highly contagious and that I should have oral sex or kiss ANYONE. I've always been really good about this. I never kiss or give my boyfriend oral when these occur but today he was leaving for work and I walked him outside and he wasn't thinking and kissed me goodbye and I couldn't move away fast enough. Now my worry is that he will get these now. I never got these from sexual activities seeing as I would get them as a very young child. What's the probability of him gettting them?! I'm so scared. I would never want him to suffer from these painful disgusting things.