
Depends on the context tbh, your friend? Obviously not if thats your normal behavior, but if youre someone who never uses socials and youre liking porn stars/of models/your ex/whoever else then yeah thats weird and theres some intimate infidelity going on, a lack of loyalty to your partner is cheating and that doesnt only mean having full blown intercourse with another person
Definitely agree that the definition depends on the relationship. If people’s attention spans were longer the question would be “If it were completely up to you, would liking an instagram post of the sex you or your partner is attracted to be considered cheating in your relationship?”