My (32F) fiancé (28M) of 2.5 years called off the wedding, but wants me to order my dress. Mixed messages and I don't know what to do.

Advice wanted.
We have been together for 3 years, engaged for 2 and a half. We were friends prior to the relationship, after having met at university a decade ago.
The relationship has seemed good, albeit tainted by some personal, emotional issues of his and mental illness of mine (I have spent the better part of the last year with depression).
We had our wedding booked for last year, with him being completely on board and then he went quite quiet. He didn't want to plan, despite deposits being paid etc. He eventually confessed he wanted to "postpone" and left me to arrange that. I felt embarrassed calling to cancel our venue, who promised us that we could reschedule for no charge, up to the end of this year. He reassured me he loved me and encouraged me to go ahead ordering my dress (the shop had the deposit and wouldn't return it, but no order had actually been placed).
A week ago, I received an email from the venue asking where we stood on rebooking. As time had passed and he had made such good progress with his issues, I broached the topic with him. He was evasive (very difficult to get him to communicate, which has caused a lot of heartbreak for me).
Eventually tonight he stated that he doesn't know when he wants to get married, maybe in his "30s or 40s" was how he phrased it. I was obviously upset, but kept calm and asked him if it was perhaps not marriage itself, but maybe he just didn't love me enough or want it to be me. I told him that I needed to know if that was the case, as he's been a lot colder with me for a long time and I was beginning to feel insecure. He insisted he would feel the same way with anyone.
A very short while later, I asked him if I should just consider the dress deposit a loss, rather than paying the balance and losing that too (if it just wasn't going to happen). He was against that and stated that he "may surprise me" by wanting to get married in a couple of months. He wants to stay engaged.
I'm so confused. It's completely different messages and I'm left heartbroken.
I've taken off my ring and I am currently sat upstairs silently sobbing and he is acting like nothing has happened. I popped down to the kitchen and he chatted to me like nothing was wrong. I asked him how he could be ok and he said it "wasn't worth getting upset over".
I feel broken. What do I do?
Tdlr: fiancé cancelled our wedding but then gives very mixed messages on what he wants to do. Feeling unloved and confused.


Source.