Dear apple-slice:
Welcome back! So you met him in person for the first time and it was a good experience, good thing. Regarding your insecurity in the LDR context, wanting his undivided attention, reads like you want too much from him, that is, he can’t fix your anxiety and insecurity. Even if he gave you his undivided attention and reassured you repeatedly and frequently, all it is likely to take is one time that he is unavailable and the anxiety is back.
One solution is to take a break from this LDR, but if you return to it, the same anxiety is likely to return.
Best bets for you is to be in a relationship with a man who is local, a man who needs and wants to see you often, one who is predictable and reliable, while even in these favorable circumstances, you will still need to manage your anxiety, to not expect or ask or demand of the man to fix it, to take the anxiety away (he can’t and likely has his own anxiety!)
I hope to read more from you.
anita