
At this point, you can clearly tell that they both need to break up. Both of them clearly doing something unfamiliar to them, overpowered feeling of love and jealousy is not something you should let yourself get lost on. If you don't know what to do, communicate, and if you don't want to then don't ever seek relationship again.
This need more chapters though. A good story can't end with a "meh", this will be a waste if there'll be no continuation after all of those.