How would you feel if you found out your partner was talking to people of the other sex on messaging apps but?

-The content of the conversations was non-sexual/non-flirtatious

-The people they were talking to were 100s or 1000s of kilo-meters away

and they were doing it before they met you.

Updates
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And they had a photograph of you with them in their profile pic (i. e. anyone talking to them could tell you were in a relationship).
How would you feel if you found out your partner was talking to people of the other sex on messaging apps but?
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