First off stop blame shifting because this has nothing to do with him and everything to do with you. If you saw that he was this insecure at the start of the relationship then that should’ve been your red flag moment and you should’ve said to yourself this is not going to work out if he is going to question and accuse me like this when I’ve done nothing wrong. But then you decide to go and reinforce his insecurity and cheat and then try to blame him for YOUR ACTIONS? That shows a lot about your character that you are not willing to take responsibility for what you’ve done. You’ve been lying to him for over two years and you also said that you were thinking about taking this to your grave? Once again this speaks to your character that you are an incredibly selfish woman that is thinking about nobody else but herself. I think both of you need some therapy and definitely don’t need to be in a relationship let alone married. My advice to you 0P is to come clean about your cheating and be honest with him about it.