<human>: I've been friends with this guy for over a couple of years now. We are (I thought we were...) really good friends. We would often see each other. A few months ago I had to stay at his place for a week or so and he told me he had a lot of close friends but that I was one of his most trustworthy one etc. He has invited me the previous two years.

Thing is, since September we haven't been much in touch as we are both on a very competitive course which takes up a lot of our free time. We didn't see each other much but spoke on the phone every couple of weeks for 20 minutes and have been to lunch together etc. We even saw each other 10 days ago and it was like we were best buddies.

I'm extremely offended he didn't invite me. Is it acceptable to ask why I wasn't invited (obviously in a calm way, not like "WHY THE FUCK DIDN'T YOU INVITE ME")?

Thanks

Can you give me a shortened version of the text?
<bot>: Good friend didn't invite me to his birthday. Should I be offended? Can I ask him why he didn't invite me?