I've been going out with a girl here at my school for the past six months. Last weekend I went home (out of state), and fooled around with an ex-girlfriend. She called me last night and told me that she might have an STI. She went to the doctor this week and told me she would let me know when she finds out for sure. We didn't use a condom.

My problem is, what should I tell my girlfriend? I really love her and don't want to ruin things because of this stupid fling I had. But I can tell she's annoyed that I've avoided her all weekend. I can't exactly tell her next time we get together that I don't feel like fooling around, but I don't know how long it will be before I know if I'm infected. And what do I do if I am? Help!

When my boyfriend and I began our sexual relationship, he insisted on using condoms. I gratefully agreed because I felt it then wouldn't be necessary for me to tell him about my STD — herpes. Now, two months later he's decided that he "trusts" me enough to stop using the condoms. I don't see any way I can keep the relationship, even if he can handle the STD part, if I tell him I've been lying over the past two months. Do you have any advice? I don't want to lose him, but I don't want to be responsible for giving him any diseases either.