How do I ask him to tell me how he feels more?

My boyfriend of three months is wonderful in many ways. He shows me how much he cares and appreciates me with physical touch and services but he rarely ever tells me so. I think I can count on one hand how many times he has told me how I make him feel. One was how I make him so happy but since then pretty much nothing. So it puts a lot of doubt in my mind despite all the other actions. How do I ask him to voice his feelings more? Or should I just be patience and maybe time will have those come out. His friends have also told me he does not let his feeling out to really anyone. So dunno if that will even help cause they known him for decades.
How do I ask him to tell me how he feels more?
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