do you believe in ghosts?

earlier tonight my boyfriend and i got into a pretty heated arguement. it ended in him sleeping on the couch, me in the bedroom. i’ve NEVER slept in the bedroom alone because i’m afraid of the dark and loneliness. so i take a shower, get out and get dressed. i go into my closet to get some clothes and turn my closet light ON. i cracked the door behind me and forget to shut off the light, and get dressed in my room. i lay down in bed and start watching youtube and finally get tired enough to shut my phone off and close my eyes. BEFORE i even shut my phone off i looked at the closet, the door was CRACKED, with the light ON. i think “should i shut it off to save electricity?” and then think “no because i am going to sleep in here alone tonight, and don’t want to sleep in the dark”. i turn my phone off, roll the OTHER way and sit and stare at the wall. CLEARLY seeing the yellowish light casted on the wall i’m looking at. i sit there and think about our fight for a few minutes then finally rest and close my eyes. i can’t sleep so i’m just laying there with my eyes closed. about 10 minutes goes by and i hear my dog wining, i roll over, the closet door is WIDE open with the light completely off. i’m in pitch black. freaked out i grab my phone, and go out to the living room as quite and fast as i can. when i get out there i woke my boyfriend up in tears freaking out. he grabs a knife and goes into the bedroom to check it out, sees nothing. we looked through our entire apartment and didnt find anything. so we lay down in bed together, im still freaked TF out. i turn on our roku to have a ‘night light’ since i was so scared, and the FIRST thing that pops up on the screen is a picture of a BOOK, with his deceased bestfriends name on it. the book has two guys talking to eachother. almost joking or something. i CANNOT make this up. i do not sleep walk. my boyfriend had been asleep for 2 hours at that point, and wakes up at 4 am. he doesn’t play games like this. and i didn’t ever ONCE fall asleep. is this a ghost??????? should i be alarmed????? i can’t sleep now.