New pet

Melina🐱
About 7 months ago I got a new cat (John Darling) and about a month ago I lost my other cat (Dalileh) that I'd had for almost 10 years. John really liked Dalileh and he has seemed really sad since she passed. Would it be a bad idea to adopt a new cat? There will always be another cat that needs a new home but I want to make the best decision for John. If anyone here has had similar experiences or any good ideas I'd love to hear them.