Prioritize your relationship

I lost my relationship because I was too focused on my job and setting us up for a future. I wasn’t there for her and couldn’t take the stress so I asked her to move out. We stayed in contact for 2 months but I wasn’t there for her because I couldn’t balance my career and not having her there for me when I got home. She says she’s over me now and moved on with someone new. It’s been a week since no contact. My work is now slipping because I have no drive to work without her. Everything I was working for feels like it was for nothing.