[help] My boyfriend broke up with me, moved out, and now wants me to take care of his dog.

HELP! I am so stressed out and heart broken. I can't decide if i should keep a dog or if he would be better off somewhere else.Here's the backstory: My boyfriend of about a year and I just broke up. We lived together. He had a dog when we met. This dog is not the most well behaved dog by any means. He has bit me before, he destroys the house, and he is aggressive. He is also a 3 year old border collie-husky mix that doesn't get nearly enough exercise by his owner. Since he's lived with me i've taken care of him. I take him on walks, play dates, to parks and beaches so he can run off some energy, etc. I feed him and brush him and let him out in my (small) yard to use the bathroom. He has been so good since I've been doing this. His behavioral issues have not gone away completely but I know with lots of energy, patience, and love i would make it work and try to train him better without his "dad" hindering that.The problem: I live alone. I work full time. I am 25 years old and I want to possibly take a traveling position for my job. Might also want to go back to school.. The possibilities are endless now that I am out of the relationship i was in that I changed all of my original life plans for. The dog is currently moved out of my apartment along with my ex boyfriend. My ex works 70 hour weeks and does not want his dog anymore. He is trying to get me to take him and saying he will drop him off at a shelter if I do not.If i take him I won't be able to have people over in my apartment because he jumps all over everyone and tries to make them pet him then he shows his teeth and snarls. It's uncomfortable for me and my guests. I also will have to board him any time I travel which is expensive and unfair for the dog.I love this dog. It's taken me a year to get used to him. I feel like I'm the only person in the world that will or could provide him with what he needs right now. I know that's not necessarily true, but if he ends up in a shelter i fear no one will adopt him due to his aggression.Just want some insight. So far everyone I've asked has said "DO NOT TAKE THE DOG. HES NOT YOUR RESPONSIBILITY. It will hinder your freedom." Besides my animal loving friends that understand my struggle right now. I just want the best for the dog but also myself.Any advice helps. Thanks. via /r/dogs http://ift.tt/2s2C4SQ