Do you get jealous when your SO likes the opposite sexes picture?

Some men and women get jealous or upset when their SO likes a photo of the opposite sex. Others only get jealous if it's a bikini photo or scandalous, or someone that is from his past. And others, don't get jealous whatsoever. 
I'd like to hear your opinion on this and your thoughts! Unfortunately, I do get very jealous if my boyfriend likes a photo of a woman if her cleavage is even showing. It's usually if it's women that I do not know. I don't think I'm unattractive nor do I think he'd ever cheat on me, but why do you think some of us (including me) get jealous or threatened like this?! I wish I didn't care :( 

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