Your boyfriend is dishonest and sneaky. Why on earth do you want to marry someone who not only breaks into your e-mail, but creates a proxy account of your e-mail? 😯 Then, he was immature enough to blame YOU for figuring out what he’s been doing. His jealousy issues and demands are his way of controlling you so he can manage his fears and insecurities. This is not a healthy guy.
I know you think you love him, but I’d suggest you re-examine what love is. It’s easy to love someone who is damaged or troubled, but it doesn’t mean you should spend time with them and it certainly doesn’t mean you should marry them.
It’s time for you to move on and find a man who has a good character, above all else. 😉