Boyfriend has hpv, how can i prevent myself from catching it?

You can't: Take the immunization for hpv and this will protect you from the strains that you have not already met. Everybody has some strains of this ubiquitous virus and most are at worst just minor nuisances. That you're in a relationship and want to be physically close is great, and the hoopla over a virus whose dangerous effects can be prevented by routine health care shouldn't interfere.