Why did he stop making an effort with me?

I've had a crush on this guy for such a long time now. And we recently started talking consistently. And he was so sweet, curious and very flirty. But also very honest about himself. I really really liked him. We even had a “intimate” moment.

After that, he was still making an effort with me. Then a few days later, he said he had an off day and went to the gym as he had “things on his mind”. From then, he doesn’t talk to me much anymore. And if he does, he doesn’t make an effort to engage with me. If I try to be playful like we always were, he shuts me down and withdraws. It makes me feel incredibly incredibly insecure.

i mean he's so attractive, my mind has already adopted the idea that, someone else has probably come into the picture and gotten his attention.

Why did he stop making an effort with me?
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