Oltrepassassi's manga / #psychological(66)

Yeah, everyone in this story was nuts. Self centered, asshole ML obsessed with his ex, female lead that has some obsessions aaaaand thinks she understands ML, and her best friend that becomes self absorbed and steals the ML Why have the baby if you're just going to drown yourself and the child?

The ending isn't clear. Did the killer and his lover die? Did only the uke die?