You do come across as somewhat needy and insecure but Id not blame you, i suspect that it’s partially because he isn’t fully available for you and isn’t as commited as you’d like him to be.

You subconsciously sense it so you feel anxious, you become needy to calm your anxiety. If you were with a man who was very emotionally available and commited to you, you’d be able to relax and you’d not feel anxious and clingy, you’d not need to call him every minute because you’d feel secure in your relationship.

You don’t feel secure in this relationship and going by what you described not too many women would be secure with this guy (unless they just go for casual sex encounters).

I think you tend to be attracted to unavalaible men (he isn’t the first guy of this type) and your issues stem from there (were your parents emotionally unavailable?).

I’d recommend seeing a therapist to work on the roots of these attractions.