But it just might be because he's afraid he'll lose his No.
( But ( it ( just ( ( might ( be ( because ( he ( 's ( afraid ( he ( 'll ( lose ( his No ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (CC But) (NP (PRP it)) (ADVP (RB just)) (VP (MD might) (VP (VB be) (SBAR (IN because) (S (NP (PRP he)) (VP (VBZ 's) (ADJP (JJ afraid) (SBAR (S (NP (PRP he)) (VP (MD 'll) (VP (VB lose) (NP (PRP$ his) (NN No)))))))))))) (. .)))
He's definitely afraid of losing he's No.
( He ( ( ( 's definitely ) ( afraid ( of ( losing ( he ( 's No ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBZ 's) (ADVP (RB definitely)) (ADJP (JJ afraid) (PP (IN of) (S (VP (VBG losing) (SBAR (S (NP (PRP he)) (VP (VBZ 's) (NP (NNP No)))))))))) (. .)))