Sad for him that he won’t admit you don’t do that without realising you are into other things and trust me, I am the biggest supporter of everyone being their true selves
Be sad (and angry) for yourself.
There are plenty of bi and gay men out there living authentic, honest lives. They're not lying to, using and abusing someone else like he is.
And they accept the downsides of living authentically ... That they are extremely unlikely to have the traditional, conventional setup with wife & kids for their family, workplace, community etc.
Like a number of men, he wants both ... At the expense of someone else. He doesn't deserve pity. He's an immortal user. He doesn't care about his partners feelings, welfare, right to an authentic relationship.
Anyway, that's just the sexualitg side of things; he's a cheater generally too, he's cheated on you with women. What's he going for next, having done it with women, now (at the very least) done it emotionally, verbally, mentally etc with men (they're not talking about Fortnite on grindr) .... Trans people?
Who could be fucking bothered with him, seriously.