You are right - having HSV 1 first makes your HSV 2 symptoms milder.
Has your boyfriend actually been tested for HSV 2 to determine that he is not infected? If not, he should be.
Also, we know that taking daily antiviral therapy is both safe and effective - it reduces transmission by 48%. I think if he is truly uninfected, you should seriously consider doing this to reduce his risk of infection.
The risk of him getting HSV 2 from you, using daily therapy and no condoms, having sex about twice per week, is 2% in a year - that is, if there were 100 couples in that situation, in a year, 2 men would get infected.
This is also his decision, how much risk he is willing to take.
I would suggest that you consider reading my book, The Good News About the Bad News. There is a lot in there about this situation.
Terri
Sorry - I should add that I have had HSV 1 since my early 20's. In reading responses to other folks, maybe that is why the HSV 2 has not been so horrible for me. Could that be true?