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Get an new hobby. This will take your mind off this person.
The word "hobby" like a hobby you have, for example "collecting sea glass is my hobby", the word hobby is a noun.
Though in the phrase 'hobby horse' it serves as an adjective.
She collected bugs as a hobby.
Her hobby was sewing.
hobby = el hobby or el pasatiempo
Keep busy. Take up a hobby. It takes time. Keeping busy will give you less time to dwell on your loss.