I mean, do you want a dog?
A dog is a HUGE responsibility. It isn't to be taken lightly.
I don't own one anymore, but it is a big commitment. If you have the resources and the time on your hands, then sure keep the dog, if you want one and are willing to put in all the work and money that goes along with it.
If not, you can always try and find somebody you trust to take care of him, I would advise against any kill shelter, and try to avoid a shelter at all if possible. Dogs are great, when they have great owners!
Make sure you teach the dog you call the shots / your walking IT and IT isn't walking you. Training a dog is essential. Can't stand dogs that are loose cannons running around everywhere with clueless owners who don't know how to control / communicate with their dogs, basically due to the fact that they never bothered to train it.
Good luck with whatever you decide I'm sure you'll do the right thing,
Take care!