My 6 year old son , myself and boyfriend were sitting on the couch watching a film. My son is not my partners child . Anyway I was holding my partners hand but my son removed it so that he could hold my hand instead . I could instantly tell that there was a mood shift with my partner after my son done this. He left abruptly (after 15 mins) didn’t see the film through and didn’t really bother to msg me the rest of that evening which is unusual , he responded to my msg asking if he was ok and replied really abruptly with no kisses . I have a feeling that this is a red flag him getting jealous of my son , what do you guys think?