you arent enough for him. no one is enough for any one person. its an extremely unnatural thing for any member of our species to be completely "satisfied" in all physical regards with just one person. in fact, its even possible for a pairing of a specific couple to match up in such an exact way as to be completely infertile with each other (but have no problem reproducing with anyone else). there are few other signals more convincing than to say that monogamy in its most pure form is not biologically beneficial. our DNA will always, always be seeking other mates.
let your boyfriend sate whatever fascinations he has with images of other women if you arent comfortable with him being physical with them. if he isnt giving you the amount of attention and care you mandate, find a new boyfriend. if he is fulfilling this, then relaxing his borders will likely really make him want you more if his love is genuine. tighten the leash and he will likely want you less.
let your boyfriend sate whatever fascinations he has with images of other women if you arent comfortable with him being physical with them. if he isnt giving you the amount of attention and care you mandate, find a new boyfriend. if he is fulfilling this, then relaxing his borders will likely really make him want you more if his love is genuine. tighten the leash and he will likely want you less.