The bad news: without more specific details, I’m not sure you can.
Regardless, I’m going to do what I always do in these situations: insert myself in the middle and riff a little bit. Making a decision about a guy is no different than any other decision. For me, I decided back in 2004 that I wouldn’t sleep with anyone who wasn’t a girlfriend.
I'd been with my boyfriend for six beautiful months of To us, and all of our friends, agreeing to a single date with a dude implied consent to monogamy thenceforth.
Going out with somebody else the next day would therefore be cheating, a cruel thing to do to your boyfriend on the all-important 24-hour anniversary.
It was jarring to find out that our great aunt had basically spent her youth as the whore of Babylon. You're going to date Veronica _and _her best friend A lot of my friends, male and female, followed this kind of "Medieval Courtly Love, With Blowjobs" model well into college, like knights and ladies with bitterly divorced parents.