Why would my friend say this?

I remember at one time my friend said that he wasn’t messaging me as much as he could. I told him that I understood as he has a girlfriend. He said that wasn’t an excuse. I went on to say that was the reason I had cut back on texting with him. I asked him if his girlfriend would appreciate it if we were texting all of the time. His response to that was, I could either let it bother me or think who cares. Now what kind of response is that coming from a boyfriend?
Why would my friend say this?
Add Opinion