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It's no surprise that uki would be worried when Fulgur wasn't there greeting him with that smile uki loved so much.
what if fufuchan was tired of me..what if he got bored of me? What if he's found someone better..?
All these thoughts swirled through his head, usually these sad thoughts of insecurity wouldn't bother him since Fulgur was always there to reassure him. Tell him that Uki was the only one in his heart, that Uki would always be on his mind no matter what. Uki felt like a fool right now..he wishes that instead of worrying about all these "useless" problems he could instead tell everything to Fulgur and they'd work this out together. He knows Fulgur would be able to calm him and reassure him...but the idea of voicing out his feelings is scary and uki isn't brave enough to face his fears.
The thought of losing Fulgur... Was the scariest thought. The one person that uki finally trusted and loved.
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