Scared to decide

This particular indecision has been going on 2 years. Too long. And now it’s distressing. I am divorced with 3 teenage offspring. My current boyfriend wants me to commit to him. As I have been unsure how I feel about him, (he is fantastic and cares for me and does anything for me and looks after me), but I just don’t like to spend lots of time with him because it feels too clingy, touchy feely, and I can’t just relax around him. But I’m scared of making a wrong decision, losing him, and not finding anyone I like. I feel horrible, and probably really scared to be alone. What do I do?