"I'm not ready for commitment," he says. That's what he said to his past flings before, and every time, the cycle repeats. They'll have fun, which will probably last for a month or two. If unlucky, then a few weeks. After that, they'll grow tired and just stop talking. He is not certain if he's the problem or if it's the other person's problem, but either way, it won't work.
With his time occupied by his life as a baseball player that needs to keep up with the public appearances, and with his night life as Ultraman saving the whole city from a Kaiju, he can only lend his flings a little bit of his time. He never saw it as a problem, though; they take what they can get, and they never complained anyway. He made it sure from the very start that he's never into the serious setting; they must've expected him to be in it for just the fun.
But then, you came.
As dangerous as that statement may sound, you are far from looking "dangerous." In fact, you are the opposite of it. You seemed like the embodiment of heaven, and the moment he realized it, the moment he realized how fucked up he is. You have shook his every bit and made him reset his brain every time his gaze landed on you. Labels really never mattered to him before, but every inch of him is desperately asking for reassurance. Maybe you see him more than just a short fling that you could throw away after you make use of it.
Despite his attempts to hide those feelings, those intense yearnings to be called yours, he found himself dialing you for the sixth time this night for the reason that you are not calling back, not even checking the messages he sent from you hours ago. He's worried, scared, and frustrated—he's feeling too much at once, and it feels completely foreign to him. He doesn't know what to do or what happened. Are you tired of him already? Or maybe he did something wrong? Or are you in danger?
Fortunately, in his ninth attempt to call you, you picked it up. "Hey?" his tone uncertain.