LDR different countries

My SO(24) is in Brazil and I’m(23) in America. the time zone isn’t bad, it’s only an hour difference. The misery waiting to be with him again is hard. Flights are not cheap. It is going to be hard work. But I love him. He’s the best thing to ever happen to me. He is so caring and sweet and so honest with me.

But here is the real problem. My sister and mom watch a lot of 90 day fiancé and are trying to sway me into not trusting him. Trying to convince me he doesn’t love me and just wants to get a visa. Any advice on how to respectfully tell them to shut up? It’s really getting on my nerves and making me anxious.