yes it would be much happier with a companion.
Right now your ram is heart broken.
Actually, (oddly enough) the same thing happened with my keyhole cichlids.
But it was my female that died (of unknown reasons too! :sad) leaving a heart broken and lonely male keyhole. So I went out and got a female (I sure hope so), and even though it may be a runt, I think seeing another keyhole calmed him down and made him happier.
NOTE: Keyhole cichlids never like being alone whether it's pairs or not anyways.
But yes another ram would be beneficial.