I need advice

So I'm currently talking to my bestfriend. Me and him have been bestfriends for 7 years now and everyone always said they wouldnt be surprised if me and him went out because we were always flirty and we always had a romantic vibe. As of 5 months ago I had gotten out of a very toxic 1+ year relationship. My ex was very toxic but the thing that bothered me the most was he was terrible at communicating and that's what made me end our relationship. My bestfriend knows about all of this and he is one of the people that helped me through the relationship and the one who told me to not keep going back to my ex. Currently my bestfriend is being like my ex with the terrible communication and it's getting annoying I wanna talk to him about it but I dont know how to. It makes me cry at night thinking about how I dont wanna lose my bestfriend but he is doing stuff like my ex did and it reminds me of my ex. Please help, how do I bring this up to him like what do I say?