in my own opinion if they are your investment you should be the one deciding if you want to let some go. I would not give up any of my animals just because my boyfriend didn't like them. And just because you have been in a relationship 8 months doesn't mean it will last forever... I've seen too many friends be with someone for long periods of time give up things they like just to make their s/o happy and end up breaking up. You should do what makes you happy and try and be happy with hobbies that make him happy (weather it's video games, cars, or whatever else guys like to do.)