My wife is my best friend, she lost spark.how can i light it back up?

i drive a truck 4 a livin to provide for my family. would come home tired .wife wanted to things together i was too tired to do themwith her. i would bring work home with me ie.,negative parts of it to wind down. not realizing the effects it had on my our marriage. Came home one day wife is crying and said she lost spark.at first she say she thinks its her.i believe im the cause of it all.just by the remarks i make not realizing she was interpiting it diferrently.she'd buy clothes wanting feed back from me .as again i didnt show the effection she wanted.id come home spend time with our 18month old son or should i say catch up.wish i never became a truck driver.i thought i was doing her a favor by being with him and ignoring her at the same time.got a local job staying at a friends house to save gas and give wife space .we've gone on dates since then.some times i believe its getting better.then when i try to show effection we're back to square 1. what can i do get my wife back?