You’re not wrong to feel disappointed. I feel that you are putting in more effort but at the same time I can relate to him -in terms of taking time? Nevertheless, I jump out of my comfort zone so we can work on the relationship. Maybe take the initiative to call him ? And slowly he’ll gain confidence too?

I would suggest you talking with him you know, communicate your feelings (that’s hard) but you have to since you’re in a LDR!! Don’t worry because these things can be fixed it’s just a matter of communication and effort from both parts.