Is it normal my ex text me after several years expecting me to be his gf

Me and my ex had a good relationship.
We broke up because it wasn't developing, but then he wanted to stay friends and we really were best friends.
Eventually we fell out though.
Years have passed without me hearing a word from him.

He was very sweet.
It got fucked when he started refusing professional help and became an angry person.
When he got worse he took his bad feelings out on me.
He put me down infront of strangers.
It was an overwhelming sudden change in personality but to me he was still the sweet guy he'd been before... Denial I guess. He still was sweet but not all the time. Suddenly he was angry about something again. He has a disorder which affects his reactions and temperament etc...

He suddenly reached out to me months ago.
First thing he did was say he's doing badly and that I dont care.
I was stunned. We kept in touch a but but he was impossible to talk to as he was just joking which felt immature.
All of a sudden this week he texted me again wanting me back.
I tried to get him back while we were friends and he rejected me. After the fight we had later that year he said we're not compatible and told me to leave him alone. That's when he disappeared.
I later found out he had met someone and was living with her...
We never spoke of our love lives since he said i'm a fucking pyscho stalker if I ask anything... I wasnt allowed to say certain things and I dont know why. He'd also get pissed if I happened to mention a man. He'd find it provoking and tell me angrily to keep it to myself.

Well now he claims he's discovered that it's me he wants...
He said the reason he abandonded me was he needed to experience new things for a while.
I havent seen him in person in several years nor had contact with him yet he thinks i'm gonna text him back "yes i'll be your gf!"!!
Sad part is i've always loved him all the time.
I thought he abandonded me for something I did, i've felt bad...

So now he won't talk to me. He doesn't seem sad I wont take him back, just annoyed that I wasn't pining over him...
He also keeps hiding having had a relationship which makes me wonder... what else has he hid maybe even while we were a couple 😟 ... I do not know why I feel so shaken up but I cant handle all this...