How to stop being dick whipped... that was the original question right?
If you prefer being with men with big dicks, actively seek them. Problem is, you may be missing out on some very special men if that is your main focus.
You are whipped when it comes to this guy. You love his cock, you love how he fucks you, you love the attention he gives you. The thing is, cocks are a dime a dozen. You are putting him up on a sexual pedestal, where he probably doesn't belong. His dick is just a dick. Sounds like the person attached to that dick is not wanting the same as you. You are wrapped around his finger for more than that dick. Are you chasing him because you know you can't have him?
Sounds like he will continue to want you as a fuck buddy until a lady captures his heart. He tells you he will always fuck you, but you know he won't. Will you continue to fuck him when you fall head over heels for the one? I don't think so.
I would also suggest looking at your priorities. Believe me, I enjoy sex, and a lot of it, as often as possible, but I realize there's more to life than cumming on a big cock.