Somebody call Guinness, because i'm pretty sure we've got some world-record contenders on the "long jumping to conclusions" category.
Are you all the kind of people that freak out if someone doesn't text you back within a minute? There is nothing in this manga that suggests that she jumped, or killed herself in any way, or left her girlfriend, and certainly nothing suggesting shew went back to her husband or another guy.
She left the room. That's it. The empty apartment is meant to be lonely, and we're supposed to recognize that there's a disconnect between how the two women are feeling, but that doesn't mean the world has ended or that anybody's gone suicidal.