I'm going to lie to my boyfriend because I want him to be happy and support his dream
Is this dream something that relates to your relationship?
I think he has the talent but never got a chance to develop it due to us being together
While I don't think lying is the best way to do it, I support what you're doing.  It's good of you to want your boyfriend to realize his dreams!  I hope both of you find happiness.
OMG this is going to be great!
It is great that you are giving the effort to support the dream of your boyfriend. I assume that this is going to mean a lot to him in the grand scheme of things.