<human>: My GF and I had a solid relationship, but in the last year of it I started to come to terms with the fact that we were not going to be happy together in the long term...or at least, I wasn't. Small arguments started escalating, and my time to grow professionally and personally started being severely restricted by the demands of a overly complicated relationship. Typing it out makes it sound petty...I know relationships take work, but when I started to not want to put the work in I knew it was time to end the relationship.

My problem right now, is that my (ex)girlfriend is really an incredible person. Besides being my bestfriend, she is heading towards a successful career in a medical field. She just started med school and is meeting tons of new people - who all seem to be attractive, traveled, and heading towards successful careers themselves. I'm no slouch...I am working towards success of my own, but I am quite lonely right now and knowing she's jumping into this awesome group of people is making my heartache. 

I know I made this decision...and I still think it was the right one even if I have occasional doubts. But I still love this girl and the reality of completely losing her, to such a great group of people, is eating me up. I would never express this to her, I'm happy she is moving on, healing, and finding happiness...I truly am. But I'm struggling. I was hoping someone in this community had a similar experience and could share some thoughts.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Struggling seeing the girl I still care for moving on with an amazing new group of friends and colleagues...even though I know leaving her was the right choice. Can anyone here relate or share their thoughts?