Have you ever did a Good Deed that backfired on you for no reason?

I been teaching my neighbors’ son that has disabilities On how to play guitar , the kid is so happy and excited that I been taking the time to teach him , he is 15 years old but sadly he is like an 9 year old , he does t have any friends’ so another reason I do this for him , so I go over to their house after work every Wednesday to teach him for an half hour or more , I am just teaching him the basics and he is so happy and excited when he knows I am coming over , He texts me every Wednesday morning and asks if I am coming over , I am also friends’ with his parents’ and things were fine for some time , but now the parents took a break from each other apparently and the husband hasn’t been around , the husband called me out of the blue and asked me personal questions about his wife , basically asking if I noticed any cars in the driveway etc. I told him No , I haven’t really noticed a thing , I said I didn’t even know that you weren’t there. He asked me to pretty
Much spy on her and keep tabs on her , and I told him sorry but I don’t want to be caught in the middle of this whatsoever, He said Why are you fucking my wife? I said you’re joking right , but No man I am not , I said whatever is going on with you and your wife is between you guys’ so please don’t drag me into this whatsoever I said I am just doing this for your son. He apologized and said he was sorry for saying that to me. Now I am debating on whether I should go there today after work , I already promised their son I was coming , but I don’t want to be caught in the middle of this whatsoever , . I don’t know if I should say anything and just keep my mouth shut to his wife , but if the wife tells me things , I was just thinking I should just play dumb and act like I have no clue what’s going on. What would you do in this situation?
Have you ever did a Good Deed that backfired on you for no reason?
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