Hi I think I would feel the same as you. A birthday is a big deal and I think it is usual to expect the person you are in a relationshio with to want to be there with you to share it. I don't think it sounds odd that you are feeling insecure. Perhaps you should try and observe the situation objectively for a few weeks and see if you think you are getting enough positives from it to keep it going. A more straightforward relationship might suit you better. Message me if you want to chat. All the best.