Welcome to HCM,
First of all he is not a outside person , as he is your boy friend , you can expect HIV
when he is a outside person and you don't know him . HIV is transmitted due to sex with multiple partners .i agree with that , but as it seems he is your known person ...practically asking how many men are restricted to single women or how many women having relation with single person.?
So don't worry ..don't be panic and don't go through the Internet trying to find out what is what ..it is waste of your time ,.
Take care bye