When I was 14 years old, me and my cousin who was 18 years old, we used to like each other. My brother and my other male cousin (of 17 and 16 years of age at that time) knew about us. One day all of us were walking together and my other male cousin and my brother started to tease me and my cousin and in that teasing my other male cousin might've asked me and my cousin the ijab o qabool , and I think I might've gotten married to him. I don't remember exactly what happened. I don't know the exact question my other male cousin asked and I don't know if me and my cousin said yes or no. I asked my brother who was there at that time and he said he doesn't remember anything. I asked my other male cousin and he also said that he don't know. All I  remember is that all of us were laughing and I was feeling shy, and my other cousin saying "congrats, you may now kiss the bride" and me saying "no", smiling and walking away. The reason I think that we might've gotten married is becasue two years after all of this, I heard the hadeeth saying that nikah, divorce and taking back one's wife takes place even if done in jest. I didn't know what to do so, I asked my cousin (to whom I think I might've gotten married to) to text me a divorce message. I didn't tell him why I was asking him to send me such a text and I lied that I am playing truth and dare with my friends and they have given me a challenge. After I insisted a couple of times, he sent me a text saying only the word "divorce" and that's it. I asked an imam about the divorce and they said that this divorce doesn't count because first, I framed it as a challenge and the guy was unaware of the nikah and secondly, we don't know if he intended it or not. I asked two other imams' and they said that just like the nikah can take place even if done as a joke, the divorce can take place as well. And I also read somewhere that once he sent the divorce message it became a formal writing for which no intention is necessary. 

So, now I am confused and worried. I don't remember anything. Did the nikah take place? Does the divorce count? Can I marry someone else? What if the nikah did take place and now I forgot about it, then that would mean that I would be living a life of sin if I get married to anyone? Please guide me as to what should I do next.