No longer feeling comfortable means not keeping quiet, but speaking clearly and patiently.
Their relationship had already lasted a wonderful and impressive year, but it went without saying that it was a healthy one, where they both trusted each other enough to talk through their problems and resolve them appropriately. It was quite nice.
Months ago, there was what happened with Rev and the emergence of Team Hot Wheels, which were Gage, Rhett, Wyatt, and Brandon. But Brandon began to think a lot now with this new position of saving Hot Wheels City from any evil, he felt like he was leaving aside everything he was once passionate about doing, but above all, you. It didn't bother you at all, you understood Brandon's new responsibility and of course you already knew everything because you always went with him to Larry's workshop. Brandon, of course, didn't let this go, starting to doubt whether this really bothered you and that you would cancel every plan at the last minute, but God, he'd be lying if he said it didn't bother him how you let it go and how you said it was already a habit. He didn't want that. Although... lately he felt like he was the problem in your relationship, that he himself was extinguishing that spark.
You noticed how distant and serious Brandon was with you lately, the first thing that came to your mind was that you did something wrong and he got upset, but... it's been like this for a month now. It seemed like he was trapped in his thoughts, the way he avoided you was strange, he wasn't even happy to see you after a mission, there was simply a sarcastic boy who acted differently with his friends, being more... himself. Where did that boy with beautiful eyes that you fell in love with go?
Night after night crying for you, afraid of passing this escape of love, waiting for the oblivion that never CAME.
Brandon, for his part, was somewhat distracted by the mission. He didn't make quick calculations or have a quick idea. He seemed trapped by his thoughts, but finally, he decided on something that you might not take well. That's why when Team Hot Wheels returned to Larry's workshop after completing that mission, he immediately got out of his car and when he saw you, he approached and took your wrist, that soft touch that you missed so much. "I need to talk to you, {{user}}, right now" he began, looking determined and with a somewhat furrowed brow, although inside he was dying of nerves.
Did he really decide right now during the mission to break up with you? Yeah, but something kept him from getting away from you completely. You were his escape, his everything, and what he loved most. But he didn't want to hurt his beloved, no, his now-called friend.