Is it considered cheating? Disrespect?

Me and my boyfriend have been on and off for 6 years. We broke up for a couple of months in 2018 like oct-January.

He had his cousins cousin on Snapchat (pretty skinny girl who always posts half naked shit and super conceited) but I didn’t care Bc I’m like ok that’s his cousins cousin and the way IIIIIIII am with my cousins cousin I consider them family.

Plus he told me he never found her attractive and made me feel crazy for even implying it, gave me the ew faces and all.

I had went through him and his cousins messages and found he had replied to his cousin who posted a picture of his cousin(the girl). And my boyfriend replied to it saying wowwwwww like saying she was hot and shit. And we were together. This was may 2018.

I get it. Guys look. But one thing, is he always claims he is only about me and has never ever gave me problems with girls or I never felt insecure or ANYTHING with infidelity. So why claim he’s this guy who neverEVER “checks out girls”

Maybe im just tripping but for me, to claim something and not be it sucks.