Hi. It's great that you're considering getting your rabbit a friend. Rabbits really like to be in pairs, and can get bored and restless and listless if they're by themselves. The best way to find a bunny friend for your rabbit is to find a good rabbit rescue, they'll help you find a suitable bunny that both you and your rabbit will love, and will help you with the rabbit 'dating' process, which turns out is pretty complicated! I wouldn't just buy a rabbit yourself and hope they'll get along with your rabbit, it can be a recipe for disaster. Rabbits can be quite choosy about their friends.
As far as loving you less goes, I doubt that will be the case. As long as you still spend lots of time with them both you should be part of the rabbit family same as you've always been. Rabbits can effect each others personalities though so you might find that your rabbit gets more confident, or more snuggly than before they had a companion rabbit but the rescue will help you make sure it's all in a good way and the other rabbit doesn't make yours more aggressive.
I'm sure others will be along with more great tips. Good luck with your search for another rabbit!