Since you want his time, whether it be over the phone, a video chat, or in person, he makes himself available to you.
Even though the conversation stays platonic, the fact that he made time for you on the spot and without hesitation is a clear sign he secretly likes you.
After all, he had these female friends long before he met you.
Nonetheless, after a while, it started getting to you.
A buildup of moments where you were hanging out with him, only to have it be interrupted with text messages or phone calls from several of his many female friends.
The best friend who has had your back through thick and thin has been such an anchor.
So much so that you are almost in disbelief that your mind is flirting with the idea of whether he has secretly been the right partner for you all along.
Throughout your friendship with him, you have been diligent in maintaining a platonic vibe.