Hello there!!
Good questions you are asking yourself there. I wish I would have asked myself the same questions before I started my training.
I still think flying is the best job in the world. I enjoy it everytime I sit in the cockpit....but not a day goes by that I don't ask myself if it is worth the personal sacrifices.
It all depends on the job you get after flightschool offcourse...but in my case I spend on average 21 days a month away from home. The days I am home I am stressing to keep up with paying bills and all the small things that needs doing....I wash my uniform...pack my suitcase... and I'm of again.
If you are very adventurous and like living out of a suitcase then it is great...but if keeping a steady relationship is a main priority I wouldn't recommend it.
Some people seem to manage...but none of the people I trained with still have their girlfriend around.
Good luck!!