what is going on with my Pisces man?

hey all! word of advice for me, if you can! so, i've been dating this Pisces man (that's the first time for me, i am a Libra) for a month. he is absolutely amazing and i am falling for him so hard already, but things took a strange turn lately... we are basically a couple but i've been feeling him much more distant, and he has been flaking all of our weekend plans for the last couple of weeks, even though he never missed our gym sessions and still treated me as a princess in person.

on thursday, after he sent me his usual good morning text, he went silent and stopped responding to my messages. on friday i sent him another text because we had big plans on saturday, and he responded stuff like "hey, don't worry i am fine, i am just going through a moment and i need to be alone, if i don't write, that's the reason, i need to reset." and haven't heard from him since then. i replied like "it is fine, take the time you need, i am here". i didn't hear from him yet but, he is posting stories like "i thought i didn't need anyone, but when she writes to me i find myself smiling like an idiot", or "i would look at you as if you were the sun".

i may see him today at the gym but i am not sure, since we didn't plan on going together and i am super anxious on how he will behave and how i should behave, if i see him.

now, is this a normal thing for Pisces to do? what should i do? as a Libra, i feel the need to ALWAYS communicate and this is so frustrating! but maybe you do have better advice for me... i would really appreciate that! and thank you!