<human>: Can you provide a brief rundown of the text in within 3 sentences?

Bit of back story: she moved to another country for uni about 2 years into our relationship. We tried a year of long distance but I felt like the relationship was stagnant so I ended it. I know we won't get back together, and we've maintained no contact. She has moved on and is seeing other people whilst I'm stuck obsessing about exercise and basically nothing else. I can't stop checking her reddit / Facebook but it's just making me more miserable. I feel like I'm only happy in the gym. Just wondering if there's anything I can do to get out of this rut and really move on?
<bot>: Replacing gf with exercise and feeling exhausted and miserable. In need of something to get me out of this rut