(Dating) Emotionally unavailable people

In desperate need of advice , me (27/f) have been dating my boyfriend (27/m) for over 1,5 years. The first year was nice and we moved in after 9 months. We were happy and even though he is not quite open with his feelings, to me he would express his love and reassured me whenever needed. Until last summer where he went on a holiday with friends and when he came back it´s like someone else is my boyfriend.

We were on the edge of buying a house (that he initiated) but he told me he was scared and did not wanted to go through with it. He told me he had doubts about everything but also that he really loved me and sees me as the woman he wants a future with.

I have tried listening to him, validating his feelings, giving him space. And he says I´m doing everything right, that it has to do with him and himself and nothing with me.
However I am missing the way we were, it seems like emotionally he has closed himself off and every form of intimacy is forced. I know he is trying but I feel so confused… I feel like I am standing on a crossroad, do i continue this relationship or call it off? I love him, but I can not recognize the man i loved in him anymore. It´s like he is a zombie. I already had a convo with him in which I told him something needs to change, and he says he will try everything and does not want to break up.

I am starting to lose patience with him not knowing how to express or feel his emotions and needing more space, I am feeling hurt by the sudden chance in our relationship and trying to understand it all..

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Are their people here who have dated someone emotionally unavailable, or people who know they are unavailble that have some solid advice.

Thank you so much in advanced!