I ran all throughout high school and am currently on a D3 team, but I just don't have the love, or the spark, for the sport anymore.... How did I get it back?
No one can make you love it brother...either you do or you don't. I lost the love for running by the time I was 30, only to get it back for brief stints since then (I'm now 45); I still run for fitness but only love a run maybe once per week max these days. For some people, things other than running become more important.
Keep running if you want, but perhaps tell yourself that your burning love for it is gone forever, and that's ok.