When I was 6 I used to hold spiders trying to get bitten so I become spider-man. Didn't work out and I think that's where it started. My disappointment with spiders was so huge that it turned out
to be a fear.
Actually I am joking (except for the part holding spiders trying to get bitten to become spider-man). I don't know where or when it started, but will certainly try to make more progress.
On that note, if it helps, spiders don't really bite humans very often. A lot of what people call spider bites are welts from other critters or just rashes. Spiders aren't really designed to bite mammals, so in most cases they can't or at least can't easily. Their fangs may be creepy but they aren't really the right shape to bite a human. There are a few exceptions, but I don't need to creep you out if you are blissfully ignorant about the goings on in Australia.
You lived with that giant spider for how long and nothing happened
maybe he even helped take care of some disease spreading bugs or those more prone to bite. That said, I'm not phobic of spiders but that guy would unsettle me a bit.
I'm sure you are probably already aware of that and you aren't actively afraid of spiders biting you, but little things like that to help you rationalize their presence may help. Like I said in my first post, I expected people would recommend exposure therapy. If it works for you great, but thats really not something for someone who isn't a professional to recommend to someone with a phobia. Exposure therapy without proper control can have the opposite results, making things worse.