I will try to give a bit of context without rambling. I am in my early 30s and my Dad is in his late 50s. He lives alone and has done since he separated from my mum when I was 9. I am his only child. I have two young children of my own age 4 and 7 months.
To my knowledge, he has never tried to date. He lives a solitary lifestyle, seemingly by choice. He doesn't really have any friends: his closest friend and neighbour died about 5 years ago. He works full time and says he doesn't even really interact with his colleagues.
Now onto the problem where I'm wondering if IBU. For Father's day this year, I offered to make him dinner, as I do every year, and take him out. He usually accepts the dinner but not the day out as they're 'not his thing', same happened this year. Unfortunately, on the day, both DD and DH were ill with a stomach bug so I apologised and suggested we reschedule to the following weekend. He was non-comittal about this but agreed, then weekend comes and he says he is busy! I ask him when he is free he says he doesn't know and is being very shady about things. During a phone call that afternoon, he said that I don't really make an effort with him, he didn't even get a card on Father's day and he had to tell his brother (my uncle who I have nothing to do with) he'd had nothing and seen nobody. I repeated my apology about the illness but he continued to rant how he only lives 5 mins away but he never sees me. In hindsight I could have potentially popped his card around but I thought it'd be nicer to give it to him when I saw him the following weekend. I am usually the first to message him, I try to arrange things to do together but it is difficult as he can't eat many foods with gut issues he has, he doesn't really have any hobbies and he doesn't like going out with me and my DC as anywhere fun for them he says isn't his thing and he just seems bored.
AIBU? Am I missing something?