Should I be worried?

So my boyfriend and I have been dating for 1+ years and prior to us dating he did have an ex. Recently I have seen he follows her “private” Instagram where only a certain few people can, and I have seen this page and she does post pics in her bra etc. and this seems weird to me, or I’m just being jealous and insecure but should I be feeling worried?
Should I be worried?
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