I can cover my feelings while I am with him.
Covering your feelings is neither healthy nor helpful for you or the situation. It's suppressing something that is there and real. It's not being honest with yourself.
I am sure, nursenurse didn't mean it literally when she said that you should never come across as emotionally needy. It's not the "coming across" that should be your focus, but what "factually is", and the facts are:
Yes I am "in" love with him.
I just want him in my life.
By hiding them you push yourself away; that can be detrimental to yourself, if done long-term. And no matter if you do it successfully, you may not get the end result you wish for! He might not love you, now or later.
I made the same experience like you a few years ago with someone with another disorder and PTSD on top. He did the same thing your guy did. At the time I felt vey certain he still had feelings for me, but, and that's key, he took a decision. You can take a decision and stick to it even though you feel something differently. (And, for the records, I am not saying I was correct in assuming my guy actually still had feelings for me.)
I was in love once and it turned into love, the feeling of love, that is. That, too is a difference. I felt love for him, and still took the decision to leave him. I took my feeling of love with me and it lasted another year before it subsided. But I took that decision and have stuck to it since. Also, it will not change in future. Because this is best for me.
I also think that you are abusing his trust. He trusts you are telling him the truth when you say you don't love him anymore. Because he believes that, he meets up with you and spends time with you. I would ask myself whether he would be spending that time with me if he knew? This paragraph, of course, is based on what you shared with us about him, so when I write things like "he trusts you" or "because he believes you" it's really an assumption based on what you shared in your posts.
Please also consider thinking carefully about how much you would suffer day in day out spending time with him and suppressing your feelings. Having his face right before you but not "being allowed" to touch it. Not "being allowed" to kiss him. Not "being allowed" to tell him you love him. It's hell, I'm telling you, from experience.
I am sorry you are hurting so much.