I have an Android phone. Never owned an iPhone. For some reason, there is one single person who whenever he texts me the text goes to iMessage on my Mac laptop and does not go to my phone at all. His messages used to go to my phone, but they no longer do. When I text him from my phone, he receives it but when he replies to me it goes to my Mac and not my phone.
What could be causing this to happen and how can I make his texts go to my phone?