Right now you are in limbo.

You were criticizing him for his disappearance but now when he suddenly returns with a flimsy excuse (that he could have told you days ago) you are considering welcoming him back.

You have apologized for "pressuring" him and you have not indicated any particular length of time that you are willing to wait for him. In other words, he can conclude that you will wait indefinitely for him, because you consider him to be a good thing.

He has a free pass and a ready-made excuse (his alleged anxiety) to string you along indefinitely until he alone decides that you two "have gotten to know each other better." If he ever does decide that.

He has a history of erratic contact and now he has a ready made excuse to continue that and to make you wait forever.

Unless you "pressure" him to fish or cut bait.

You could for example tell him a specific date by which you expect to meet him in person, and that you expect daily contact until that time. You could just tell him that you need a man you can rely on and that you can't countenance his unreliability and the vagaries of his anxiety and so it has been nice speaking with him. Or you can sit and wait indefinitely. Your choice.