I'm wary of trying to reverse-engineer human behaviour, especially as it applies to personal relationships.
Besides, who decides what's the “best” course of action here? Who decides what the goal is — length of relationship? Happiness? (How do you measure that? Pleasure endorphins? Well then the correct response is you should stop talking to your partner, and do some exercise and drugs!)
In practice, the person who decides is the person in Google's office at 17:00 on a Friday.
(This is why driverless cars are hellishly scary, by the way. Any car that can be controlled by computer should have to use only publicly-auditable software — i.e. everything must be open-source and all builds must be fully reproducible. At least then you can theoretically be certain you know who your car will decide to save in an emergency, and why. How long before `git blame` is invoked in court in a murder case?)
I do agree with you that I'd rather make my own mistakes, than try to be a perfect partner by using an app. The idea is definitely interesting, but scary at the same time. It sounds like something out of The Black Mirror show :)
P.S. your English is great, nothing to worry about!