When you find yourself sleeping alone again

I (27, male) had been with my then-boyfriend (25) for almost 3 years. We broke up recently. We were living together and everything. In those three years we were together, we never truly connected, I knew he wasn't the one. Yet despite that, I love sleeping next to him. I love holding him, I love the security it gives me. I swear I sleep better, deeper, when I'm next to him.He and I are separating as amicably as possible. We moved into a larger apartment so we each have our own bedrooms and our own space. The past few nights I've been sleeping alone for the first time in a while. And it's hard.I find myself tossing and turning, waking up frequently. This bed feels just so empty without him in it. I really just miss that incredibly heartwarming feeling of having him sleeping next to me, even if he isn't my soulmate, we spoon perfectly. My dog is here in bed with me, but it's just not the same.I hope I get over this soon.