I have known M for approx 12 years. At one point, she was the person I considered my best friend. However, as time went on, I found her to be extremely hard work, self-absorbed, patronising and negative. There are many, many examples I could give but it would take too long. Whenever we met, she would pretty much dominate the conversation, usually about her ex-boyfriend. I'm happy to discuss him but this went on for years and basically nothing I ever said was right. She is very much one of these people that bemoans her life (fed up of being single, overweight, her job, no friends, no hobbies, etc) but would do nothing about it. As awful as it sounds, I have felt obligated to maintain the friendship out of guilt as I'm her literally her only friend but over the years, I have dwindled contact and meet ups. I'm really not an awful person but she had no one else.
Anyway, the final straw came when back in the summer, she was texting quite a bit about meeting for cocktails. After the third text (I had been replying to the first few) I decided to bite the bullet and tell her that I was pregnant so couldn't drink alcohol. I was only 8 weeks at the time and had only told both sets of parents and siblings after a private scan. So I rung her and told her. Her response: Oh great, another friendship that's ruined then. When I asked her what she meant, she said that I'd be too absorbed in the baby to see her anymore. She then asked if it was planned...yes it was....Are you happy about it....well, yes clearly. She then spent another ten minutes rather aggressively questioning if I would be finding out the sex (no), her telling me that was stupid as I should find out so I can buy pink or blue things, asking if I had a preference for a boy or girl (no, I really don't, as long as baby is healthy) implied that I was lying because EVERYONE has a preference 
. Her mother, who I know to say hello to when I see her, sounded thrilled for me and offered her congratulations. I then wanted to finish the conversation as DP was coming back to the car from the supermarket. M gave a half-hearted 'congrats' just before we hung up. I'm not expecting a fanfare and confetti every time I tell someone I'm pregnant but for the person who I've known the longest, that was the worst response I've had and honestly, I was quite upset and annoyed. We haven't been in contact since.
My baby is due early next year. DP thinks I should give her one more chance. My question is, should I contact her after the baby is born to tell her? AIBU to not want to bother anymore?