Confusd, plz help.?

6 months with this guy.. I try to let go. I always end up just talking to him though. It is never-ending. If he picks up the phone in a pissy mood, I get angry and hang up or if hes with friends and I thought he was coming over, Ill get hurt. If he doesnt call back, it hurts and scares me. I have to call, if I dont, I will get nightmares. If I get scared about something, I call him bc he's my comfort, and two nights ago he made me feel better and I had the strongest urge to tell him I loved him. So I did. [Mistake?!]. And I went to sleep, woke up, thinking and feeling about him, had thoughts about him, but when I look at him, something feels wrong. Then I get scared about him and another girl. iDK why it feels wrong as in physical or something. I was attracted to him physically but lately, when I look at him, he looks different TO ME. Unattractive. Then I distance myself away and dont want him. Like he looks older but I never thot of it like that, just lately yes. What wrong with me?