Boyfriends best freind likes me😵

Ok so it’s this dude Justin and we recently met through Shane, my boyfriend. Me and Justin are like best freinds now because we got really close. But the other day i sent streaks and it was a blurred pic of my face and a “S” drawn over it. He said “you damn cutie 😍😍” And i was like “what?” And shit. And then if i say good morning or good night he calls me babe. I’ve told him not to call me babe, but i don’t know whatta do bc he keeps doing itttt. And he told me he liked me i said “in what way?” He said “as a girlfriend type way” and asked me not to tell my boyfriend. What do i do guys?