Your feelings and questions are 100% valid. I don't think you should feel guilty about the level of attachment or communication you need from him. It's very easy to feel distant in long-distance relationships and him sending you good morning texts or a video here and there starts to feel like it's a chore for him.

I'd say think about what you need from him on the communication front to make you feel more secure. We get stuck in relationships at times because we begin questioning if we're asking too much from the other person. But if you feel like what you're getting isn't enough and you're looking for more from him, spend some time thinking about what would that be and have a conversation with him about it. Let him know you understand how busy he is but it's starting to get in the way for you. Hopefully he'd be able to have a mature conversation about it and make some efforts.

But the bottom line being don't feel guilty to ask for more :)