It seems to be about what he wants and needs and what fits in with his life.
Agree.
What do YOU want and need and does this arrangement fit with YOUR life?
Think about that. You did not and will not get what you want from this character. Any revived relationship will be a substandard version of the one you had before - he shat on you from a great height and has chosen to take you back with even lower standards.
You know the answer. You know the outcome.
All you have to do is to resist the urge, impulse, compulsion to get back with him. This isn’t for ever - it might only be days / weeks. Say No and Block. Then all of the ground you have covered to date will not be wasted and you won’t have your self esteem crushed a second time.
Anyone deserves more than the RS you initially hard and definitely much much more than the one he is offering you now.
This is just a booty call, stop gap, whilst someone else comes along.
Don’t do that to yourself.
You deserve better. You are in 100% total control of which way you jump right now and if your life continues to move along in an emotionally healthy way - or if you choose to be drawn into some v chaotic and damaging situation which could pollute the next year of your life.
Your choice. Think carefully.