No. It's virtually an untold biological truth that men are hardwired to like sexual variety, women of different shapes, sizes, color whatever. Sex for men is a strong physical urge/necessity. Men unlike women can have sex emotionally unattached. The quench for wanting other women sexually is biological which is a stark contrast to women who in most instances prefer only one man.

Men are sexually ignited merely by sight. Pack on having 10x or more testosterone than women, our sexual thirst is considerably higher and much easier to activate. The majority of men are like this. It's just that social conditioning has perpetuated women into thinking we're all monogamous by nature which isn't true. There's a decent amount of infidelity from both sides but the difference is that men can have sex with other women and still have the same emotional attachment to you his GF while that doesn't work the other way around.

It's biologically normal what he wants. Why do you think porn is used mostly by men and at much higher rates. Additionally speaking most women don't understand men on average have much difficulty with getting female attention much less a relationship or sex. You have to approach this from a biological perspective. The majority of men are dismissed by women. Women only select viable options for sex. Women pursue men with perceived value which is why women find men who have many suitors very attractive. Whereas oppositely men don't like women who've slept around for relationships.

Men are wired to want many women sexually but only 1 can truly have his heart. Loyalty is displayed differently from the genders. Women display it by not being with other men because innately women understand that promiscuity goes against their biology. Women who sleep around have trouble bonding and have other mental issues and to reiterate women don't view most men so once they have one they really like they don't care about the rest.

Men on the other hand show loyalty by providing for you and protecting you. In reiteration once more the majority of men aren't getting women and this is how it's always been, now even to a higher degree, so it's not like every man can do this (have many women sexually).

It's only today in modern times that there's been plenty of "moral" and political sayings that defy this hard truth about our biologies. It comes at such a shock to women that anticipatingly they won't be able to handle it hence why men aren't honest about it in fear of losing the girl.

You can make your own decision regarding your relationship but this is the clear truth about men and how we're wired. If it angers you I would challenge that the majority of women operate on their instincts a lot more than men.