What should I do with my (ex?) fwb (lasted 12 years) who is dating another girl?

I’m F32 and he is M38. We have been fwb since I was 19 y.o., but we took two breaks by my choice for around three-ish years in total.

We used to see each other once a week. We bought toys and costumes for sex and we also friends. We talked about our life, we had friends in common so sometimes we also met around.

During this period we also see other people, but nothing serious. We didn’t use condoms but we did with other people.

Suddenly he tells me to have met a woman and had sex with her without protection. I felt betrayed and angry. Since then he has disappeared for a month, then we have met, we had sex and he confessed me that he is dating her seriously.

We have flirted anyway, we had had some project and now I feel lost. We told me that in any case he will be my friend, that he isn’t only a sex toy (I’ve never seen him like that). But now he is disappeared again. I have a lot of stuff in his place. I want to know if I have to take them back. I also have to give him a medicine for a ist I had.

I don’t understand why he isn’t clear. Is it over? Ok. I think he is avoiding me because he hasn’t been taken a decision on what to do. I’m sure he likes me. He cares about me. So I really don’t understand his behavior.
He is always been afraid of commitment, what is changed? Why her?

I need to clarify this situation. My life is very hard now. My bff is recovered in hospital and there was months I haven’t seen her because her addiction. I have problem to sleep and probably I will have to go to a clinic soon. My psychologist is gone and I’m waiting for another one. Even if she said she will be always available for me.
I’ve been crying for days. I lost my persons all together around few months. I don’t know what to do.

Tomorrow I will try to contact my ex psychologist. But with him? I feel like he treats me like a stranger.
Bth I have always though I will fallen in love with someone else before him. Or that we would continue our relationship forever.
I’ve always thought that if we hadn’t seen each other for 10-ish years, things between us would restart as ever.
He is special for me. I don’t wanna lose him. I would tell him about my bff. I wanna him in my life like usual. With fun, flirt and games.

I love had sex with him and I know it is the same for him.

I asked him to see each other, but it wasn’t clear. He said yes, but also we is very busy this period. I feel like he is avoiding me. I don’t understand. Like I said before the last time I saw him he seemed confused.
But why don’t tell me how he feels? What’s happening.

What should I do? What should I say to him?

Thank you and sorry for my English, I’m not a native speaker :(.

If you have any questions, don’t esitate to ask.