What do you think about me making a secret account just to "like" my boyfriends posts? I know it makes him happy.
Why did you make a secret account to like your boyfriend's posts?
I want to make him proud about me and I want to let his parents know how proud he is of me as well.
Although you may think you're doing the right thing, you're ultimately lying to your boyfriend and it will be worse if he finds out. Talk to him about his insecurities and be there for him when he needs you.
His parents like me and I'm proud of him.
Your heart is in the right place. It's sweet of you to want to make him happy, but using a fake account is a little misguided. Try to find other ways to help him with his insecurities that won't backfire.