My partner went out and got drunk, he gave his number to a girl which he first said he didn't remember doing and maybe it was his friend who did it, then that it was a random girl, then that it was someone he went to school with. He said that he lied as he was drunk, I was 'going on at him' and he wanted me to shut up. He apologised and then said that he couldn't do anything about it and I needed to stop dragging it out and get over it. I don't know if anything he said about what really happened is true.
Yesterday he saw a direct message of me wishing a guy I went to primary school with happy birthday, he responded thank you. That's the whole conversation, I even said to message him if he doesn't believe me as there is nothing going on. But all hell has broken loose and he's saying I cheated on him? The double standards is honestly baffling me and now I'm starting to second guess myself. We've been together for 14 years and have a child together, I feel like we are too old to be having these kinds of problems but he's giving me the silent treatment because of it and it's giving me the worst anxiety, I think he's expecting me to apologise but I don't think I have done anything bad? Have I done something wrong?