I need friendship advice...

I have been best friends with the same person since I was in junior high. We were inseperable when were were younger, and even after college. She got married, had 3 kids... meanwhile we stayed close and I was single and got the partying phase out of my system (throughout our early 20's).

Now it seems roles have reversed. I've been married for 2.5 years and we just found out that we are having our first child. I'm happily keeping busy with my husband, work, and preparing for the baby. On the other hand, all she ever wants to do is go out to bars and get high.

Some factors to take into consideration:

•She is promiscuous, and craves male attention way too much for it to be healthy. She is constantly hooking up with new men she meets online or in clubs or bars. She's also been known to see men who are in relationships. All of this goes against my morals and she knows this. Her last born child was with a one night stand. She has no clue who the father is, and still continues this behavior after giving birth to her.

(I've told her a million times she's better than what she's doing. She will agree with me in a deep heartfelt conversation and then continue the same behavior).

•I love her kids, but she has a completely different parenting style than I will have. Simply put, she doesn't make them mind. Last time they came to our house they broke magnets on my fridge and smushed up a bunch of those gel-like halloween window clinger things. Then they started going through every drawer/cupboard/closet in my house. I tried correcting them, but they just looked at me like I was crazy and moved onto the next thing to destroy because their own mother is right there not even making them mind, or caring that they're ruining my things.

(Also, the more I tell her kids to stop, or redirect their behavior to things that are acceptable to play with she will give me a dirty look like I'm crazy for not just letting them destroy everything. She's clearly irritated that I am constantly interrupting her story about some ridiculous drama to tell her kids to behave).

•I can't stand to go to her house anymore. She lives in a pigsty. She doesn't clean the litter box as much as she needs to so it stinks. There's pet hair all over. I'm talking, you sit down, and you're totally covered. (Please note, I also have pets and this does not happen at my house). There's usually food or drink spilled on the floor, dishes aren't done, toys on every square inch of the ground, etc.

(I have helped her clean MANY times before. Her sister and mother have as well, multiple times, but it always returns to this state of disaster just days after so I have gave up and refuse to offer to help even though it makes me uncomfortable to even sit down there).

• She's already gushing about how she's so excited to be an "auntie" She tells me she will be at my house all the time to hold the baby and that she will babysit all the time for us, even if we don't need her to. As in, she will just take our baby for "auntie time" even if I don't need a babysitter... Sidenote: there's no way in hell I would trust her to watch my child alone. Ever.

She also talks about how she's so excited that our kids are going to be able to grow up together, and how they're going to be best friends. She even goes as far as fantasizing about trick or treating, easter egg hunts, going to see santa together, etc...

(pump the brakes. That's family time. That's not happening either. On top of that, I really don't think I want her kids to be too close with mt kid because I don't want my child to pick up on their bad behavior).

What I'm getting at is it's getting to the point where we really have nothing in common, and I can't get behind the person she has become. It saddens me to see who she has become. I loved every single thing about the responsible, loving, dependable, caring person she once was. Now if someone asked me to describe her, I would only be able to say: self-centered.

Do I stick it out? (I already have been sticking it out for a almost 2 years now, thinking she will come to her senses if I just give it time and keep being supportive). I feel bad ending the friendship but I'm not happy staying in it. I really do not know what to do. I'm so quiet, I have a hard time being blunt with people, especially her because she knows more about me than anyone, and in a weird way, I really do still love her like a sister, even though I really don't like her anymore.

Does anyone have advice? Anyone go through something similar? I feel like I have to break up with a friend, and I don't know how to handle it.