I wonder if every bisexual has trouble with their first gay relationship cause the other p...

Ok first off being gay and bi r not the same thing, this is a huge problem in the bi community, when u r a bisexual and u r in a relationship with someone who is gay 2 things can happen 1. Your partner is constantly suspicious of u because they assume u r going to cheat on them with the opposite gender (this is why I cant get a gf any girl I've been interested in claims I'm going to cheat on them with a guy) 2. People (including ur partner) assume once ur in a gay or straight relationship that u r no longer bi that u r gay or straight and that u were either "confused" when coming out as bi or were "too scared to come out as gay". Basically every relationship a bi has is going to have these issues, it's very rare that a bi is in a relationship with a partner that doesn't believe in bi stereotypes and at the Same time doesn't try to erase their sexuality.

Thank you for coming to my Ted talk

my bad replace gay with “into the same sex or not”*

As a dude who actually lives in this world, I can tell you this: We aren't exactly too bothered about the labeling of "bi". I think, because so many people treat us different, gay people are extra aware of their gender and sexuality and their implications. Therefore, most of us are aware of the fluid nature of one's sexuality. When a guy tells him he is bi, for me it's just he is in the game. Even a guy who claims to be straight and fool around with guys at least once, he isn't "straight" for us. So how dudes identify themselves "straight"/ "bi"/ "gay" and how we see them can be different. Of course I'm talking about the adult world. But doubts and insecurities can arise when you are in school or very young. So to answer your question: Mostly, no.

Yeah I do think generally sexuality is fluid, though I don’t wanna go around telling people which sexuality they should identify with.
still it is a bit weird there’s people out there who identify as straight but occasionally engage on same sex behavior too. Maybe it goes back to the sexuality is a spectrum thing but I’m not going to go around to every such person saying that they homo

Yeah, it probably is a good idea not to go around telling people that they are gay lol. It's up to them and they can use a label when they want. I was only talking about how we "see", NOT how we label/ call them. Again, label makes less sense to us than straight people. But I don't think it's weird people prefer to identify themselves as straight though they bat for both sides. Knowing how gay people are treated by different parts of the world, it's no wonder so many are reluctant to come out. I hope the society would be more welcoming so ore and more people can embrace their sexuality.