Yes- you know exactly what it's like to live in my head! And the elation-depression roller coaster is so intense. Lately I've been doing a lot more yoga to just give myself a break from that headspace and focus on me for a while. The thing is, I usually intuitively know how people feel about me- I tend to know when people like me or don't or are attracted to me and so it is really rare when I find someone I can't read. And then it's like this puzzle that I just have to figure out and it feels like solving the puzzle will bring all the pieces out there in the universe together and I will finally get it. LOL- of course I know it doesn't work that way, but it feels that way. But when others are so much easier to read, and he is this enigma, it's very hard to move past it- I just want to know him completely and solve the puzzle. I have a sister I am really close with who is also an INTP, and I find her fascinating as well- obviously in a different way- but I just can't wait to spend time with her and find out what she is thinking. It's almost as if I can read everyone else but INTPs and so they are the people who most intrigue me and satisfy my desire for intellectual stimulation.
We INFPs DO have a tendency to latch on. And then they consume so much of our energy and time thinking about it, and the situation, and what should I say, and how does he feel, to the point that every conversation ends up elating or depressing you. And trying NOT to analyze every detail of them doing something that SEEMS meaningful