Do you think Vegeta ever felt jealous about Bulma's relationship with Yamcha???
Hmmm good question. This sort of falls into the infamous 3 year gap where, well, anything could have happened. I could see Vegeta be jealous if he started developing an interest for Bulma before her and Yamcha broke up. Then again, I could also see him just not give a damn, completely oblivious to them in his quest to TRAIN AND BE THE STRONGEST AND BEAT THAT LOW LIFE KAKAROT!!! Vegeta is so full of himself I honestly don’t think he’d really consider there to be any competition lol… which would actually make it all the more fun and devastating if he suddenly found that not to be the case, hahaha XD Oh Vegeta, how I like to mess with you…
Anyway, where were we? Hmm, Vegeta considers everyone to be beneath him, so more canon-ly speaking, he probably wasn’t that jealous of Yamcha, at least, not that he was aware of or could admit to. He might have been especially irritated by Yamcha because the guy kept popping up at Capsule Corp and disturbing the peace, and distracting the Woman who Vegeta needed to fix/improve the GR, so there might have been some territorial issues, subconsciously brewing within Vegeta. But in the fandom world? Oh yes, Vegeta and jealousy can be super fun to imagine XD
And to add to that - Vegeta is a prince and expects everyone’s unyielding attention. If Bulma was more focused on Yamcha than him, he probably would have taken offense to that, haha. So while not jealous per se, he was probably hostile of the relationship in a sense.