Hi Vegard_PD,
I had a similar experience although I didn't end up with a girlfriend like you did
I got into the PUA stuff hardcore and went out every weekend to the bars to meet girls. I never really felt happy doing it and felt that even if I got a girlfriend this way I would not be satisfied because I felt I wasn't being my best self. My self-esteem was rock bottom while on the surface I appeared very "alpha."
Also, like you, my interest in studies fell dramatically. I went in such a slump that I believed there was no point to do anything in the world and I just kinda lived day to day like a worthless automaton. But one thing that's always kept me going was my interest in physical exercise.
I discovered weightlifting thanks to one of my friends and the more I did it, the more I fell in love with it. And also I was going into my first year of grad. school so I decided it was time to buckle down. I started organizing my life and my health. So I guess it was a multitude of factors that enabled me to find interest in studying again.
I'm going to tell you, it wasn't remotely easy to get to a point where you even want to start studying much less actually study efficiently (which is what I'm working on now).
It's your life and you decide how you want it to go. Ask yourself what is most important to you right now? When I did this, I realized it was my career and ambitions and not girls at the moment. They will come somewhere down the line and I've already accumulated good skillz from sarging so I'm not nervous around them anymore and I'm sure it won't be much of a problem when the time comes. So I consciously decided to drop out of the game and pursue my studies, health, and career actively.
You can balance both. You don't have to drop PUA like I did and just focus on health, studies, etc. There's 24 hours in a day and PLENTY of time to accomplish a lot in that span. Start organizing your priorities and work on them everyday. Then you will feel very balanced and I'm sure it will improve all aspects of your life.