My 15 year old twins are struggling with co-dependency and I'm concerned for how this could impact their futures

I have a son and daughter, Zacharie and Zephyrine who are 15, going on 16. For a boy/girl set of twins, they are incredibly close and have been since hey were children. However, I'm a bit concerned that they're too attached. They still try to match as best as possible, take the same classes, have the same interests, same life goals, and despite having their own rooms, more often that not, my husband will find Zach sleeping with Zeph in her room or vice versa. We both got them phones but quickly gave returned one because they share the other one. Zach will do anything Zeph asks and he revolves around making her happy. She's the same way and will do anything for her brother. When they were younger it was sweet but now, not so much.We always just thought they'd grow out of it so we didn't do anything, we thought eventually with the gender thing they'd stop being so dependent but they haven't. We never encouraged this, in fact, we did our best to make them feel like an individual but they'd rather be a pair. They're terrified of being separated and freak out the idea of not being able to keep an eye on one another. It's not healthy and I'm worried that this could negatively affect them. To a degree, my husband and I want to separate them and take each on a separate trip but we're concerned that it could only make the problem worse and harm our relationship with them. We've taken them to a psychologist and she said that it was unusual but noted no other problems. We're considering a second opinion despite their protests.Has anybody had codependency issues with their twins this late in the game? How did you solve it? via /r/Parenting http://ift.tt/2i5qwqX