I Want to Make Friends

guys i had a bad experience yesterday.yesterday i had met two school mates and i had invited them to my room,i had been very happy to them although they are not good guys only reason is they are my school mates then they had listened music in my ear phones which are so expensive and my smart watch they haf takennit and obereved it for some time and conversation for sometime and after an hour they left.after they gone ,i thought to hear music then i searched for it i had not found those then i searched for my watch to go outside it also not found.i got bmvery much depressed both of them worths 430$ .then by recalling all memories i realised that they had taken those, because i had locked my room after they left . i had asked one of them wether he had taken those casually but later i had called him he is not answering the call then i whats apped him later he started warning me then i retaliated on him saying that u must taken those just bring those back to me seriously and i had begged him too.i had not said these ro to my dad if i tell he will scolde me.
i am thinking to take revage on them by making scares on there face after some months,i had trusted them but they cheated me. i had forgived them all those days when i am in school,but now they doing wrong but now also i am not getting anger on them i am always forgiving every idiot how are bothering me because i had promised to my dad that i wont miss use my Karate skills.but this is so bad i am forgiving them but when i think that they had theft 430$ from me i get angry. guys pls tell me wether i have to take revange on them or leave them.