I've had mono for about 2 weeks now, when is safe?

next week, (so it will be 3 weeks) my doctor is letting me return to school. my boyfriend probably already has it. he dosn't feel sick, but we've been together constantly during my incubation period, before the symptoms most likely. when can i kiss him again, or more when is it safe to have ? what i really mean is safe without rupturing my spleen! it's a little swollen, i'm not aloud to dance. how long do i have to wait? i the missionary position and just lying there, really going to rupture my spleen, i not being a gymnast.