Boyfriend cheating

So i’m the jealous type yesterday we were put me and my bf, everything went well.

He has a girl bestfriend i’m okay with this i don’t have any problem so they went out at night without even telling me accidentally i opened my fake instagram i saw him uploading a story with her and he has hidden it from me.

I screenshoted the picture and sent him and i was so so angry he told me if i told you you’ll be upset i replied which do you prefer being upset or hiding some stuffs from you? After that he told me that he’s sorry but i’m very very sad i didn’t even done anything wrong with him in our whole relationship all the day i’m thinking of this problem i don’t know if i should leave him or give him a chance