Nothing surprising about it. He’s in a lot of pain from the break ups and doesn’t want to see his Exes. We all react in our own ways to hurt.

I think you are too kind to say he has “avoidance issues”. He doesn’t have any avoidance problems, until recently he avoided you quite well.

He’s a weirdo, be glad you are out of any relationship with him. If he wants to date you again, ask him if he has done any therapy work.

It seems excessive and a bit dramatic to me. But perhaps he’s just sensitive. Definately odd behavior.

We don’t have any information about why you stopped seeing each other.
He could feel embarrassed or humiliated that the relationship failed, or “just” really disappointed.

Insecurity issues.

Maybe he started coming around again because he’s lonely or horny.

Only he knows the real reason why. There are many possibilities, and all we can do is speculate.

Horny. Brings them back every time.

It doesn’t look bizarre to me. Maybe he had avoidance issues in the past but has overcome them and is in a different place right now. People evolve and change. People work out their issues and figure things out. Also, time heals all wounds. Maybe right after the breakup, he was very hurt and wanted to keep distance, but now he feels nothing and has no problem in talking to you again and being in the same room with you. It is not about you anymore, I guess. We’ve all been there after a breakup, where being in the same room with someone we either still love or just hate is too much to handle. On the other hand, it is a waste of one’s time really to try to find an explanation of another person’s actions. It is only plain speculation. We are not in his mind. Whatever we say here, doesn’t make it true. Only he could tell you what his feelings were at the time and what they are right now. And although I understand your curiosity, these days, I prefer to use my time and energy in trying to figure myself out, which is hard enough, let alone try to figure out somebody else.