once enemy now trying to be my friend.what should i do?

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hello friends..merry christmass to all. okay i am here to share one of my childhood experiences which i can never forget. that accident or intentionally made incident was occured when i was on 5th standard.as usual to the other days i wen school on thursday.there was a physical education class by mr. X (i shouldnt have said mr. for him).he used beat the students very badly.i was the monitor and prefect of the scool.when used to beat someone only for unable to some pity move or yoga,he used to beat them.if someones said that he is having a back pain he used to get a guardian call.and on that the mr. X came to class.and said to do a yoga.one fat boy cant to that.then he started beating him on his leg.i protested.it was my duty.i used to protest against him everyday.so he was really really pissed off with me.but never got a reason for guardian call.and all the students loved me.so the teacher cant complain against me for my inability to manage the class.and i can do the pity and yoga very well. now on that i really got angry ad said that i will complain to head.he stopped for then.i never he was finding an oportunity to take the revenge.on the next class,he dint beat anyone.now he was giving us marks.all of us went near to his table.and i saw his watch on the table.it was a nice one like father,spring operated not battery operated.i really loved to charge the spring.so was really wondering or trying to guess how many times before the spring has been charged,that time suddenly i felt a pain on my shoulder and look back and one huge slap came down on me.and i was beaten badly and he called my guardian and complain our head that i was trying to steal his watch.i said i have my own watch i dont need his watch.and then again he said "who know may be he is addicted to drug,so trying to steal that watch".my guardian came and supported me till to the end.and our principal knew me very much.and he dint say anything to me. after that he beaten one another boy and i dint protest. but this time guardian protested and wanted the resignation of the teacher.and he was forced to give resignation. and now after so much yesterday i saw my new neighbour is him.they arrived two days ago.he didnt made any mistake to recognize me neither did i.today he came to my home and said you are my best student and bla bla.the main point was that he wants my help for checking up his electrical wiring in the room. so i ask for suggestion what should i do??help him or not.because i dont want to mislead to anything wrong.thats not my nature.. thanks in advance...