Do i Believe In Ghosts?

Yes I Do! i believed in them since the day that i was at my ex-girlfriend house,(the house was around 80 years old) and she happens to have a grandmother as old as the house,no pun intended here, and even thought that this happened around 1993 i still remember that day as is was yesterday. the story goes like this, as i was saying we were at her house in the living-room, and we started getting intimate, when we hear some noises, it was her granny walking towards the kitchen,which was kind of close to where we were,so for this reason we stop what we were doing and my ex did not want to continue,imagine how i was,you are right i was so turn on and upset at the same time that i begin to talk ironically about her granny age, (sorry, i was a punk back then),i said stuff like she should be living in a museum, or that she is tricking the grim reaper for too long and it was time to stop. but pay attention to this,as soon as i finished that awful comment,my body start to experience a very scary sensation,i couldn't not move, i was cold, i couldn't talk, i try to ask for help but it was impossible, my ex, thought that i was joking but when she saw what i was passing throughout ,she stared screaming and asking for help. let me tell you this, it was terrifying.i an not a religious person,but in that moment i just pray to God in my mind,i implored forgiveness, and the sensation start to pass slowly. what a horrible experience. the only explanation that we found to this, was that my ex-girlfriend grandfather , had die in that house, six months before, and thst maybe he was upset for my comments about granny. what do you think?