A "jealous lover" refers to someone who is possessive, suspicious, or anxious about their romantic partner's interactions or relationships with others. Full definition
The proverb has it that «he's a fiercely jealous lover.» (cyndispivey.com)
Instead, my fear is Face ID makes it too easy for other people — including cops, border agents, muggers, jealous lovers, and so on — to get into your phone. (fortune.com)
God is a jealous lover, a consuming fire who wants nothing less than our whole heart. (faith.org.uk)