My husband is working abroad in a female dominated working environment . His boss is also a female . I do completely trust him as he knows very well it is completely haram to look at a non mahram etc. I trust him completely but at times I feel insecure as we have never been separated since marriage
But he follows her on Instagram.
If I will ask him about this then we will end up fighting as he thinks I don’t trust him
Please advise me how to tackle my insecurity

As long as you trust him and his religion, do not surrender yourself to the devil who aims to destroy your home, and do not open the matter with your husband.