Been with my partner 3 years, when we first met he had been single a few years, we added each other on social media, and his follow list was lots of women, not friends just randoms, fair enough as he was single then, I mentioned that I didn’t like him following them now he was with me, so he unfollowed them all. However the odd one still pops up from time to time. 2 days ago I noticed he was following a new woman and I asked who she was, he said why and then said he hadn’t followed her and must be a mistake (I don’t believe him) fast track today…he is saying he feels depressed, hasn’t slept and doesn’t want to see me tonight, says I don’t trust him and I’m accusing him for a liar etc etc , now threatening to finish the relationship. AIBU to ask who she was, should I of just left it. He is clearly deflecting now, but would welcome any thoughts.