Keep him interested

Okay this is more about the emotional part of it not sexual. So I've been seeing this dude for a little less than a month now, and it started out as if we were headed towards a relationship, which is what I want and what it seemed like he wanted. However I'm a pussy and was not able to show that's what I wanted so I made it seem as if I wasn't totally into it or something. We had a talk a while back about being exclusive but left it inconclusive, even though we said we only wanted to be with each other. On Thursday I believe I made things worse by trying to communicate even tho I'm so bad at it and just frustrated and lied by agreeing that it didn't matter if we hooked up with other people. Now I can feel him slowly losing interest and I don't know how to keep him because the truth is I know we could be good for each other but I'm too afraid to show my true colors... Advice pls