Many people дата lots of diffirente people at the same time , I personaly don't like that. It is okay if Ты see it that way или if Ты tell that guy/girl that you're also dating someone else , because most of the time people just дата and they don't tell their дата that they're also dating someone else and then everything gets crashed.
If neither of them know, then yes, it's wrong because it's considered cheating, however if all three of Ты agree to be in a polyamorous relationship, then it is okay.
Though if Ты ask me, polyamorous relationships most of the time never end well, so I'd avoid that.
What are you? A "playa"? Honestly I don't see how Ты can have a meanigful relationship with either person if you're dating someone else, not to mention alot of people don't like "sharing." If you're suppose to be their one an only или whatever they don't want Ты to be someone else's one and only too. But I guess if Ты want to дата two people and those people know you're dating еще than one person then I guess its fine for you, but I suggest all parties involved know all the other parties and that everyone is okay with the multiple dating. And plus let them know you're bi-sexual, thats is something that should not be kept hidden, или something Ты just "forgot" to mention. All parties should be okay with that too.