⚓When your boundaries are constantly being violated.  
⚓When you are with a person, your energy decreases.  
⚓When did you feel better before the meeting than after.
This is a clear sign that it is time to finish everything, otherwise you will have to pay. Have you been in a destructive relationship?

Physicist travelling around the world in my free time.

Luckily I have not experienced that, but I have had people close to me who have suffered from it and it is difficult to get out of those relationships.