Regarding the man in yellow

At first I assumed the man in yellow was living in a time loop. He loved experiencing the same thing over and over, and Julie had tried to stop him several times from killing her father.

But based on what was saw in the last episode, it doesn't look like that. Instead he is referring to Julie's several appearances through time, where they have met many times already. And when he says "This is the part I love the most, when they start ripping each other apart", he is referring to former experiences in Fromville. Like Pennywise in It that sometimes show up to feed and create chaos in a repeating cycle.

Which should make it (relatively) easier to stop him than if it was a time loop.