This guy i barely know invited me to his birthday which I decline. I told him I was busy. He kept asking me though and I just made up excuses why I couldn't go. The next day after his birthday, he bring it up again. He said I should hve gone because apparently it was fun. Later on I asked him to fix my car and he didn't charge me for labour even though he work in the workshop. He just charge me for the cost of the parts. I feel guilty somehow for not going to his birthday. I feel like he really wanted me there, otherwise why would he bring it up so much?