Am I making the right decision?  Do I still keep him there when I need someone to talk to? Or do I force myself to let go fully?

If I were you, I would not force yourself to really do anything and just let things flow and let time take it’s course and see what happens. From what it sounds like, you’ve already made the decision to stay with your boyfriend, so do that, but also respect his wishes by not being the one to contact your ex. If your ex writes or something just to say hi, I don’t think there’s really anything wrong with a short conversation to catch up, but definitely not a good idea to hang out with him in person or anything while you’re in a relationship. You don’t really have to make any other decisions about your ex right now other than to just leave him in the back of your mind for now while time takes it’s course. This is all still fresh for you, so that’s probably why the feelings feel so strong, but as the excited state dies down a little, things should become clearer for you.  You could always meditate on it, too. It doesn’t seem like sitting and doing and thinking nothing would help, but oddly, it does. haha. A clear, focused mind is much easier to work with than a cluttered one.