Is it normal/ reasonable to be upset about this?

Tomorrow is my birthday and I was talked into spending it at the house of my friend of 10 years. I love her very much, but her house, quite frankly, is gross. Her cats and dogs pee, poop, and vomit all over the floor and she and her mom just leave it. As a result, everthing is sticky, damp, and very smelly.

Now, my friend wanted to invite her boyfriend over to join us. Not wanting to deny her, i agreed. At the same time not wanting to be a third wheel and sit in the house of smells all alone while her and her boyfriend make out, I asked my boyfriend to come along. I warned him about her house, and he was visibly grossed out by the details. I realized that he didn't really want to come, and I'm not going to force him to do something just to make me happy. So I expressed to him that I wanted him to go but if he didn't want to he should just say no.

After a few hours of hemming and hawwing back and forth, he finally said no, he wasn't going. Then he provided me a made up excuse in case someone asked why he didn't tag along. He is now napping and I'm kind of sad he didn't want to go. I can't blame him for not wanting to waste his entire afternoon at the decaying home of a girl he doesnt even know but now Im dreading being there alone with her and her boyfriend.

I guess I'm just sort of disappointed, but I understand. Is it reasonable for me to feel this way, or do i have no right?