Ah I miss the discussion board on IMDB where we can argue about the plot points and all that. I watched this movie alone so there was nobody to go have pie with to discuss the movie and in particular the ending.
This movie reminded me a lot of Zauhar's debut movie Actual People. This had a similar indie vibe for sure but this one was more subdued and nuanced.
Overall I would say I enjoyed this movie quite a bit. If you've dated a woman like this, who is easily jealous and then does stuff that is very questionable in a relationship then you'll understand!
Without ruining anything I would say if you're considering this movie then go for it. It's a solid 7 indie production and will make you think a bit.
As for the ending - it's pretty clear to me what is about to happen! You'll have to get there yourself to see what I mean. If you know you know lol.