I totally get where you are. My old therapist called it 'merging'. I used to get this a lot when in my late teens/early twenties. It did take a lot of self-work to begin to overcome it and I managed to push away a lot of people in the process. Thinking back, I was often totally unaware that I was beginning to 'merge' until I was no longer the sole object of that person's attention. Then, it felt like there was a gaping chasm inside me - I was an open wound. In that state, I was incapable of functioning as a separate human being. The good news is, you've identified it and you can work through it. Some would recommend talking this through with J, but be careful - it can lead to all sorts of complications, including the delusion that you are getting exactly what you need from that person after all (they can't give it to you). I would absolutely recommend you try therapy as the safest way of dealing with this. Hope that helps.