While I may not know the reason why he broke up with you, you have to stop stalking him. You are only hurting yourself the more and don't want to acknowledge the relationship no longer exists. You will have to stop contacting his parents for the time being until you have recovered from the breakup and moved on.
Unfriend him from your Facebook account, if it is the case, and store away his number if you have been chatting on Whatsapp. You should employ no contact rule for a month so you can think clearly and reflect on the relationship. Again, it will aid you in the healing process, recovering and moving on. At the end of one month, you will know what to do, but it is better you do not get back at him. You have to move on with your life. The most important thing is to stop any contact and stalking so you can find your feet to move on.
However, if the breakup was a result of a minor issue, you can contact him and mend things after ending no contact after a month. But be prepared if the response will be negative. You will have to accept and move on.