Upset over a bad relationship break up?

Is it okay to be sad over someone that doesn’t accept you?

I’m 19 and I just yesterday got out of a relationship because I came out to genderqueer to them.

We had been dating for around 6 months and had only said “I love you” like four two months ago, everything in the relationship was going great and he knew I was bisexual and was completely fine with that.

Now before I go any further please let me stress that I never expected him to change his sexuality because of me, I knew fair and square that he was straight and that we were probably going to break up over it when I came out to him as non-binary, but his response was what killed me.

He started screaming, saying that just because I was “gay” I didn’t have to change my gender, and saying that I’m just a full on lesbian instead of Bi and that was the real reason I felt like a man, he then asked me if he wasn’t enough and I tried to comfort him but then he said “don’t f*cking touch me f*g” and I started to cry, he apologized but just said that it’s my fault it’s this way since I lied to him about being a woman and he felt used. I apologized and right before he left he just said that if I ever come back to my senses about being a woman he’d be delighted to get back together with me, then just left.

Sorry I know it’s a lot.

My best friend and my sister tell me to forget about it, that he’s just angry but I shouldn’t dwell with him.

But my problem is I feel for him, I know he’s upset and I can even see how he felt used, and after all I did date him for 6 months, even if I did foreshadow the break up, I trusted him and I thought we could’ve at least be friends.

I don’t know I guess my question is;

Is it okay for me to be upset as I am? Like I’m upset at everything he said but I’m also upset that he’s gone.. i can’t help it I don’t know, i know six months isn’t a long time but keep in mind i just moved states and he was the first friend i made here.