Why???

Why can't I learn to just say NO!!! I had the most stressful day yesterday! A friend of bf and mine was staying with another woman in my building. A few days ago they had an argument, one of many apparently. Well she called the police and it turned into this whole big, way blwon out of proportion thing. So he comes here the next night to get into the building, which he had always done when she isn't home since he doesn't have a key to the front door. Well, she is not home and has locked the place up tight, so he can't get any of his things. He comes back down and tells me this and I ask him "well, do you just need somewhere to sleep tonight?" (apparently my first mistake, I am too damned nice!!!). So he stays here and leaves in the morning. Then I hear from my other neighbour upstairs that he was back later that day and they were able to help him get some of his things. Ok, good. Well, Saturday night he shows up and asks if he can stay the night again. I said sure, and when he asked if he could leave a couple things like his tools for work here for a couple days I said yes. Well, he talks to this woman yesterday morning and she puts all his stuff out in the hallway for him and he brings it down and fill my kitchen with it! He says he just has to go through and organize it and make sure nothing is missing. OK. I am getting a little nervous for some reason now, just this bad feeling creeping in. He spends all morning on MY computer while I am washing HIS laundry!!!! See what I mean, too damned nice I tell ya!! Well, next thing I know my landlord is knocking on my door to ask about some papers I need to sign for new managers. She sees him sitting at my computer and at first I think she thought it was Brian (bf) then she did a second look and realized it was my friend. Now my nervousness had a reason. She tells him he is not supposed to be on the property! WHAT?!?!?! He had not been told this and I was certainly shocked. She tells him he has until the end of the day to get his stuff and get off the property. And tells me "you know you can't store any of his stuff here" I am just shaking and all I can do is nod my head. So she leaves and he still sits on the computer in no hurry to get his stuff packed and out. After my stress level rose to the point where I was snapping at Austin for no good reason I called bf who was supposed to be on his way here anyways. He had had a couple beers, which usually would tick me off, but it worked to my advantage cause when I told him what was going on he was REALLY mad!! I went in Austins room and started cleaning while the friend was out in the kitchen finally going through his stuff. A few minutes later Brian comes in and starts yelling at him he has 3 minutes to get what he needs into a bag and get out. He can come and get the rest in a few days WITH Brian with him, not alone! I stayed in Austin's room the whole time, lol, I didn't want to get in the middle of them. Plus I felt bad that I hadn't said anything to him myself first. But, that's me, I cannot say no to people, I cannot tell people when they have overstayed their welcome. Why?? It causes me so much stress and I just can't do it! Which is why I never have company and why my favorite thing about this building was that I didn't really know anyone. The night before the nieghbour upstairs had passed down some rye in a pop bottle for him, but he was already sleep so he didn't drink it. And in his rush to get out he forgot to take it with him. So, I went and bought some pop at the store and I drank every last drop of the rye with it! LOL!! I don't ever drink so I got pretty tipsy! After Austin went to bed of course. Well, after a couple drinks there is a knock on my door at 10pm, I knew it was him so I didn't answer. He was told not to come back unless Brian was with him. Plus I didn't trust myself to be able to tell him to bugger off if I did open the door. I went and sat in my hallway against the washing machine and called bf to tell him. Talk about over reacting, lol, that's what drinking does to me! LOL!!! He only knocked twice and got the hint and left. I think he had come back for the rye, lol, and I sure wasn't opening the door to tell him I had already drank it!! Brian is on his way over now in case he tries to come back today, he can deal with him! Teach me to be nice to people! One of these days I WILL learn!!