I'm dumb can someone explain the plot? 😭😭😭

The uke (mc) was obsessive towards the seme (ml) and he killed the seme. he went to a different timeline where the seme killed him. he manipulated him into losing his friends, and job. and at the end he found out he didn’t even love him he liked this one girl (his ex) so he killed him at the end so the loop reappeared