Is this “normal”

I’ve been with my bf for 5 months and recently within the last 2/3 weeks he’ll text me “we need to talk” I’ll call him he won’t answer and text me this is something serious blah blah blah, just to tell me he’s “kidding” again, this morning I text him GM & he responds we need to talk, I already got annoyed because this just happened two weeks ago so I called, no answer. I called again in 10 min and I asked him “what’s up” and he said he was just kidding, I got mad and hung up. He texted me “baby come back” I text him “you’re 28 years old, that’s disgusting how you do that. How old are you?? Very childish”

He replied “it’s just a joke”

He says I’m being dramatic.. I’m a 27 year old with a child, this is very immature to me.

Am I wrong?

He said I shouldn’t have hung up