I am a person who never advises others, especially when it comes to "love affairs."
This is because "love affairs" is synonymous with "logic."
There is no way to answer such a non-linear and tricky question, even if I were consulted.
Well, I won't say much, but I have a history of getting involved in people's love affairs and having a terrible time in the past.
-----
If he/she asks me for advice on how to kill himself/herself, I will tell him/her about a suicide method that is presumed to cause less suffering.
Or, I could tell you about a damned Japanese writer who repeatedly "let only his heart partner die".
Well, I don't care what strangers who are not family members do.