When a pisces man is jealous?

I had a boyfriend that I was in love with he was in aries but I ended up liking this other guy I met at a party he was a Pisces but I think he was jealous of my relationship with the Aries guy because I bumped into him and he said so was that guy your boyfriend that you came with I said yes why but me and the pisces guy had a casual conversation but i knew it felt wrong but i wanted him because of his vibe

When a pisces man is jealous?
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