All I can say is if my bf told me to not get any more snakes and to give up some of the ones I have already he'd be out of my life in a heartbeat...IMO it's not fair of him to tell you what to do with your animals and to get mad over something that he knows you've been wanting to do/accomplish. I think it's very selfish of him to do so. And if he can't back you on your breeding goals what else will he have a problem with down the road? What else will he not support you with?
Eight months isn't a long time to be with someone IMO, and there are red flags waving in the relationship already it seems from this issue between you two. I think I'd be taking a step back and really see where things are going with this guy and see if it's worth making yourself unhappy over (and you're obviously unhappy now!).
Just my .2 cents.