Can being stoned a lot cause you to forget kissing someone on multiple occasions?

I had a friend BEFORE my current partner. This person was just a friend, I told my partner we never even kissed. Well, this conversation came up between my partner and my friend. My partner asked my friend if anything ever happened, and my friend said we kissed on multiple occasions. Looking back, I was drunk/high around my friend all of the time. I don’t remember any kisses. Was this a lie? 

2017-04-11T00:37:33.809Z