Dapat ba akong magselos kasi kainuman ng bf ko yung ex niya?

Problem/Goal: Should I be jealous?

Context: My boyfriend has his own group of circle but nandon yung isa niyang ex from junior high school (we're college graduates already). Paminsan minsan nagkakaayaan sila ng inuman. Idk kung dapat ba kong magselos? I do trust my partner pero parang ang uncomfortable lang yung idea na kasama niya ex niya sa inuman. Though sabi niya tropa naman na lang daw and nothing to worry about. Alam ko rin namang hindi siya touchy sa ibang babae. I just dont know if dapat bang magselos ako sa ganung setup.

Previous attempts: Haven't talked to my partner yet.