I got caught being abit Physco! Help

So me and my ex/current situation ship has been going on for 3 years. We’ve recently been really really good and he has even mentioned to my friends about asking me to be his girlfriend! However I think I’ve messed up abit. I may have stalked some girls on his instagram and viewed their stories. He brought it up to me as the girl messaged him and I admitted it. He said it didn’t sit right with him and he felt it was abit Physco . I explained to him that it was nothing to do with him, like I wasn’t looking for anything or trying to catch him out etc I was just being nosey. He said he wanted to bring it up to me and he said if we get to a point that we don’t talk about stuff or question things then that’s when there is a problem. We had a normal conversation after wards and I rang him after work. I asked if he as upset with me and he said no, and I asked if we were fine. But I panic and overthink. We’re both busy this week/weekend so I don’t think I’ll see him. Do you think I’ve messed it up? I’ve spoke to my friends and they all thinks it not a massive issue and if it was,he would have made it known. What do you think I should do? Give him space for a few days? Let him come to me? Or grovel? Thanks!!