So my LTR of 3 months is really solid. She submissive af, wants to never displease me, etc.. Still I saw a chat today on her phone from last year september, when I was already meeting with her for 3 months (but usually only once-twice a month due to other plates) and she asked a guy out to hang out (again) (he did not reply lol).

She told me that she saw him the same day at school coincidentally and they decided they should not meet. This was a obvious lie because the text was sent at 6 pm from her.

Tbh how should I proceed? For me if I know a girl is meeting with other guys, the same time as me, I would fuck and dip right away. A real side chick only meets wants to meet with you. Her statemtents in the past made me believe she did not meet anyone simultaneously .

TLDR: Should I break up with a (really good) LTR over this?