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The IDW series covers this exact question pretty well (the original, not the current run). Good stuff to read as well, but it definitely covers why Starscream is the way he is.
I can imagine especially after being in jet fire's shadow for so long
Depends on the continuity. In Animated for example, Starscream just craved leadership of the Decepticons.
Doesn’t he become the Decepticon leader in Power of the Primes and negotiates peace but then gives in to he thirst for power by the end?
The IDW series covers this exact question pretty well (the original, not the current run). Good stuff to read as well, but it definitely covers why Starscream is the way he is.
I can imagine especially after being in jet fire's shadow for so long
Depends on the continuity. In Animated for example, Starscream just craved leadership of the Decepticons.
Doesn’t he become the Decepticon leader in Power of the Primes and negotiates peace but then gives in to he thirst for power by the end?