What should i do?

So, im 24M and my bf is 26M, we've been together 8 years, we are not a . My boyfriend like the so called twinks, i can still he kind of considered one because i look younger than 24 and my face is kind of boyish, and i am also kind of good looking too. but, anyway, he prefers 15-18 "twinks" some of them kids, in my opinion. and he always stare at them too. its very humiliating. the thing is, i know for sure he loves me deeply and that i am the love of his life, i love him too so much but, i, as a very insecure person since always, im nut sure if i can handle now but most importantly later the fact that my boyfriend likes teenagers
I kind i know for a fact that it will only get worse because well, we will get older and this situation will become more disgusting by time
Since i love him very much and he is a very nice person sincerely, i also fear that no one will give me ever the stability and love and care he gives me, i dont know what to do.

Should i give him time to change as he think he can or i should leave him