How do I stop being so blunt and coming off as a mean person?

I mean, it is not intentional at all. Obviously. I have a straightforward way of speaking and saying things. And then I get called out when it comes off as rude and then I feel dumb because I do not know what I am apologizing for.

I keep getting told by this guy I only talk to over text, that I am too mean. No one has ever told me this and I am not changing how I normally talk with him. I talk to him same way I talk to anyone else. I told him that at this point, I think our personalities do not match because I always talk like this… but I will try to work on it.

Have any of you noticed I am too rude/blunt/whatever? I am not just asking this because of one guy, it is a reccuring thing that I am getting accused of and I want to fix it. I feel I just do not understand how to speak, and then over text it is worse.