Boyfriend doesn't understand why i want to come out as bi sexual

Re

I am bi sexual. I have a straight boyfriend of 4years. He doesn't understand why I want to come out.

We started dating in high school, gay marriage was still illegal then and our town wasn't the most accepting at the time. Now it is.

I've always hidden this part of who I am and felt like I had to be ashamed of it.

I want to come out, not make a huge deal over it, just have it not hidden, like being proudly a part of the LGBTQ+ community and just having my sexuality listed in my bio on social media (even just a little rainbow/pink blue & purple emoji!). I want to be proud of who I am & be there to support others that may have questions about my or their sexuality.

I don't want to hide a big part of who I am just because I have chosen to be with this man for the rest of my life. My sexuality is not invalid just because I fell in love with a man.

He doesn't understand why it matters, why I want to come out and I don't think he wants me to. I tried talking to him about it and he fell asleep while I was mid sentence, then got mad at me for being upset & was saying I wasn't talking to him (he was falling asleep while I was!)