How to not ruin my friendship

Tbh I had no idea what to name the title but here we go. My male friend "D" recently got into a relationship after a messy breakup with this other friend (she was a common friend, so I never really thought about this problem).

I'm very very happy for him, I hope he's happy in this relationship. But here's the problem, recently I have been having thoughts on how his gf would react me talking him. We all how some relationships end because either the boy or the girl have "Opposite" gender close friends and the other partner always have problem with that(I saw a reel on ig) . I'm very close with my friend "D", we have been friends for the last 3 years, we share every shit about our life. And I don't just wanna end my friendship him just because he got into a relationship, many of my other friends suggested things like, I should end my friendship with him, stop talking him, start ignoring and many more batshit things. But I can't just do that, I don't wanna do that. I cherish this friendship very much. And this is all from my perspective, I haven't talked about this to my friend, how his gf would feel about me or anything else. He plans on meeting her next month (it's LDR)and wants me to meet her and I would love to meet her and be friends with her!