Well, how was Vegas?! You know I have done the same thing with my H, the clingy, smothering stuff. The reason I did this (and sometimes still do) is because I allowed my self esteem to be totally dependent on him. If he's ok with me, then I'm ok with me. If he is occupied by other things, people, etc., I would take that as rejection. If I want to spend every waking moment with him then he should feel the same way, right? Nope, he is a busy guy with a job, hobbies, lots of friends, etc. He wants me in his life, but he doesn't want me to BE his life. And it isn't healthy for me to want him to BE my life. I'm learning that slowly. It does take time and patience to change a behavior you have spent your whole life working on.
So take your time and fill your life with things other than him. He's going to appreciate it and you will feel better when you can lift your self esteem without his help.