Should I be jealous?

My boyfriend and I have been dating for almost four years now. At about a year and a half into our relationship we broke up (for only 3 weeks) and he ended up sleeping with a girl who he said was “only a friend” throughout our relationship. We got back together and he never mentioned a thing until 7 months ago. Obviously I was hurt and angry but we decided to try and work things out. Flash forward to today and he followed a girl on Instagram (and her finsta). However he won’t follow me on insta even when I have followed him and asked him to. I told him I was bothered about this because of what previously happened (who was also just a friend on Instagram). He told me not to worry and that I should trust him but its hard to do knowing how his last “friendship” with a girl I don’t know. He won’t tell me how him and his new “friend” met and keeps calling her a friend then an acquaintance which is also super confusing. (He doesn’t follow any other random girls on Instagram either just friends from high school, family and some models so it seemed strange) Should I be worried or jealous? Or am I overreacting?

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