why do I feel this way?

Why is it that when me and my boyfriend aren't together I am always super fucking horny and cannot stop thinking of his dick. Like how much I love it and just want to eat it and jump all over it etc. Not just it, but him. I love him and wNt him so bad. But yet, the min we are together my horniness is gone and I don't seem to want him to come near me. It's so weird. Anyone else get this