I want to apologize to an ex, but is it bad to do so?

I have this heavy weight on my mind since 2020 and I have this urge to apologize to my ex boyfriend about my mistakes and wanting to come clean to him about something which is between me and him. (Its about me lying about my age and other stuff).

I was a minor and I shouldn't even be on Instagram during that age but I met him and I had a crush on him. He asked me out and we dated online. But that's not why I came here.

Is it the right choice to apologize to an ex after 4 years of an breakup? Is it manipulative in any way? I'm not really doing it with bad intent. I just feel guilty after growing up and wanting to learn from my mistakes and become a better person. I just don't want to come out of the blue and bring back memories to him. Should I just leave it alone? I don't know if he is still active on his Instagram account anyway, but if I just leave my apology, and sign out so I don't get attach again or anything.

Write your advice / opinion below. Thank you in advance! I need help from wise people.

I want to apologize to an ex, but is it bad to do so?
Post Opinion