my bf gives other girls more attention than me

my boyfriend and i have been seeing eachother for about 5 months and the past couple months all he does is talk about other girls. mentioning how his exes, random girls off the street, and insta models look soo hot and how he would wanna do stuff with them right to my face. he always usually ends it with “it was just a joke calm down” once i go quiet and look the other way but this happens about 10 times a day if not 30+. he’ll compliment me pretty rarely and it USED to be very often when we first started seeing eachother. he always gets all giddy and “sad” reminiscing about times with his exes just to end it with laughing at my reaction. i’ve told him to stop and that it makes me feel uncomfortable and insecure but it doesn’t matter to him. wtf do i do??