Jealousy in long distance when we meet

Brazilian woman here, I have a French bf long distance relationship for 1 year, we met 4 times. As you may know, Latinas in general are jealous. I wanted to ask your opinion about this situation: bf has a good old friend, who he claims to never had intimacy or other romantic affection, for the last 5 years. During my last trip to meet him for xmas and new years, I noticed they talked with big frequency on telegram, I discovered they have an excel table with a movie list to watch together (he doesn’t know I saw that). During new year’s eve, I talked about this jealousy and how insecure I was of him talking to her lots, he reassured me, said nothing is going on, just friends good old friends, that she has a bf too. Another thing is that he’s coming to Brazil for us to travel for around 8 months together and he plans living here. It’s confusing to me cause rationally I know he loves me and has plans with me but as a Brazilian, (ik this may sound toxic) we kinda fade away heterosexual friendships or decrease contact due to respect. Ik it’s cultural but it’s very hard for me to not be uncomfortable with this very intimate friendship. Help. I don’t want to suffer and ruin anything.