Basically his life revolves around his toy poodle and I don't think he'll ever change.
You're not compatible.
My life does revolve around my own dog, who I adore. I haven't been dating since I got him, but any boyfriend would be expected to love the dog almost as much as I do. In a similar vein, anyone who has cats is instantly dismissed from online dating because I'm allergic, my dog will chase, and I couldn't ask someone else to give up their cat for me - I know we won't be compatible.
I'm lucky that my dog doesn't have separation anxiety, but at the same time I couldn't walk down the street holding hands with someone and the dog because I need both hands to manage the dog (who has different ishoos).
However,
His dog is disobedient
Do you think he would be willing to go to dog training classes? You could go together. You want good quality ones - run by someone APDT qualified apdt.co.uk/dog-owners/local-dog-trainers/ or Dog's Trust dogstrustdogschool.org.uk
You could go together - he will get help with the dog's training, you will learn more about it (it's fascinating when you get into it), the dog will be happier, and you may feel that things are more likely to work out. You might even enjoy the classes 
Separation anxiety is, however, beyond the scope of such classes, and it will be a harder nut to crack, with no quick fixes. For separation anxiety, it's more of a behaviour than training issue, so he'd need to find a behaviourist - one accredited by CCAB or APBC for quality reasons
apbc.org.uk/help/regions
www.asab.org/ccab-register