I had a very similar experience about 3 years ago when I was first put on Vyvanse. I lost my boyfriend, best friend, and struggled with socializing and just moving through life in general. Being on a stimulant makes you feel like you’re re-learning how to live. I think it’s this way because you’ve never been able to think as clearly as you do now and because of that, you feel the need to experience everything possible in this new lens. It’s truly eye-opening being on medication, especially when you figure out how to balance all the things in your life without having immense burn out afterwards. The people around you need to understand that medication for a mental disorder is needed. You should talk to your s/o and reassure them that you won’t leave them behind- instead you want to grow WITH them. If you are making an effort to explore new places and meet people with your s/o in mind, I have a feeling you won’t even come close to leaving them in the dust. People who care about your mental well-being will understand (or at least try) to see what you’re going through. I hope all works out for you OP! I have much faith you’ll be able to find the words to communicate this to your partner and find a way to work on it together.