personal fitness trainer ... or hoax 😒🤔

So I followed this guy on Instagram and he supposedly into fitness and his gf so I asked him what do you do what should I eat. We talked and then he asked for my snap chat so I said ok ... And he send me a picture of himself with just underwear and he's hard and he tells me. That's why they call me the Russian monsta. And I'm like ummm ok. Why did you send that. U have a gf. What's your problem. So I unfollowed him and blocked him and sent the picture to his gf. On Instagram. Now she hasn't responded but I have a BF and I feel like I should tell him what happened .... I wasn't flirting with the guy I just wanted to know what he does to stay fit and train me ... but. I guess he thought I was one of those girls and I'm not. I have a man. So should I tell my BF what happened?Â