My boyfriend won’t let me go

Okay so me and my boyfriend have been together for 3 going on 4 years come this may, we have a 17 month old son together and we live together. I’m at the point now to where I just want to be by myself and focus on getting my life together for the sake of me and my child. For the past year I have been unhappy with our relationship but whenever I try to break it off he just won’t let me go there’s no passion in our relationship any more I love him but I am not in love with him. He’s a good guy and a great father but he’s super clingy, and needy and extremely sensitive I just don’t want to be with him anymore I’ve even said we could still be friends and coparent but he just doesn’t get it idk what else to say or do.