There are two questions being asked here:
1) Was Gil-Galad jelous of the Númenóreans as they became more powerful
2) How did he react to their fall?
Well 1) I expect he wasn't, as Elves (well most Elves) dont seem to be that jelous of the power of others, and I am sure any jelousy he felt would have been offset against the fact that they were helping him with the war. 2) Probably badly, i expect he greatly feared an invasion of Lindon.
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Utúlie'n aurë! Aiya Eldalië ar Atanatári, utúlie'n aurë! The day has come! Behold people of the Eldar and Fathers of Men, the day has come!
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