Your dog doesn't need a girlfriend. He needs to be neutered or managed. How much exercise is he getting? How old is he? There are too many unwanted dogs in the world to allow dogs to breed just because the owner thinks they need a mate.
Or get him a male buddy to play with.
Sometimes we joke around about these things, but I don't think you are joking around. Animals aren't like humans in which we want for a partner to have a romantic relationship with and don't "need" to breed but answering ingrained survival if your dog isn't fixed.
Judging from your English, you probably won't understand.