Context:  My birthday was last week. I never heard from my brother or sister to wish me happy birthday. I guess I expected to much and they let me down
Speaker 1: My birthday was last week and I never heard from my brother OR my sister to wish me a happy birthday.
Speaker 2: oh no I am sorry to hear that! They must have been really busy and it must have slipped their mind
Speaker 1: I guess I shouldn't expect so much from them and let myself get let down like I have.
Speaker 2: I am sure they had their reasons, maybe you should give them a call and see if everything is alright. They may be going through their own problems right now. 