My initial reaction was to prefer the use of "envious" in this case, but i looked up both words again and it seems that both are OK.
jealous of a friend's success; covetous of my neighbor's possessions; envious of their art collection.
I'd maybe add 'of his success' for a little clarity, like this:
Though jealous/envious of his success, I shook the winner's hand.
'Jealousy' for me always implied something related to a love affair or human relations, but looking up the words now, i realise this was a misconception on my part - maybe this 80's sond is to blame
👁 Smile :)