Help! Friend issue! What can I do? (This is for somebody else)?

Well the person in your situation should tell Alyssa. If they don't she will find out from someone else and wonder why it wasn't one of her friends that told her. It will be hard to tell her, but as long as she does it, things will turn out the best way possible. You can't argue that your siding with Alyssa and going against Opal as a friend because Opal betrayed Alyssa when she decided to hook up with Jake, so, take the advice and tell your blog person if you want, but I'm sure others could figure this one out.