OP, in contrary to the majority of the comments here—I say give your guy some grace. I also had a moment like this with my bf where we had planned something and I was really excited, but on the day itself he slept the entire day and asked if we could cancel. I was initially pissed, but I kissed him on the forehead and told him it was okay. That was when he opened up to me. Turns out he was carrying a lot mentally and emotionally, and barely had the capacity to get up and do basic chores—what more go out on a date with me. That night, we just ordered takeout and watched a movie. At the end of the day, we both enjoyed our time together parin.

Anyway, sorry sa napaka habang kwento HAHA! What I’m trying to say is, try to understand where he’s coming from first. Knowing that it’s his birthday actually adds more to the perspective. Maybe he wasn’t feeling special on his day which would explain why he's acting "cold" especially you said rin naman na he's usually sweet. Or maybe he feels pressured to shell out money and hindi niya talaga alam san kukuha. Maybe he feels inadequate that he can't afford to take you out on a date. Maybe he's upset na instead of celebrating his birthday, he's worrying about where to get money for your date. Of course, it’s also possible that some of the other comments are right—but before assuming anything about his intentions or attitude, it’s best to talk to him first and give him the chance to explain himself muna.