What to do!? Help!

My boyfriend and I have been going thru some rough patches lately and he's been distant lately. I've been trying my best to be nice and give him space but I'm scared he'll leave me. We haven't slept together in weeks and he won't hold me while we sleep like before. He's not the affectionate type but I would notice the little things. He would always be very playful and would bug me just to annoy me but he no longer does it. He would hold my hand in the car when ever we would go out but now he doesn't. He still kisses me every morning when he goes of to work but when I say I love you he says it back without conviction... I love this man with all my heart and I don't wanna lose him. What should I do to rekindle​ our relationship? Or is it too late?