There is a dude I am talking to and I'm going to tell him that I'm also talking to other guys.
What is your reason for doing this?
He is so possessive and controls me too much
It's smart to be upfront about dating or talking to several people. Being honest in this situation will benefit everyone involved. You should also talk to him about his controlling behavior, which is uncalled for.
I feel confident in my decision.
I think you have made a good choice too, as it's good to be upfront with people you are dating about where you stand in the relationship. Dating multiple people at the same time is perfectly fine, so long as everyone is on the same page.