Guy's Behavior

Guys, why is he acting this way?

To make a long story short me and this guy met through mutual friend in September and have been dating for 6 months. our chemistry was through the roof from day one and he confessed first that he's developed feelings for me from 4 months. I really felt the same but I had fears and he did too and more considering he got out from a toxic relationship with a girl he was with for 4 years. He apparently broke up 1 year and a half ago, says it apparently left him in most down spirits. I told him that if he had fears & feels that he's not ready then it's not going to work between us even though I really liked him, said I was ready to meet someone who's ready just like I was. he then quickly jumped to say that it was "minor fears" and that it's not valid reason for us to not at least "try" or give what we have a chance.. So, I believed him.. day after day me and him got more & more attached and we started giving each other relationship experience without title for eg doing compromises, putting each other before everyone else, holding each other accountable for who we were seeing, I used to get jealous from some of his female friends who were "too close" to him and out of respect for me set them straight. I knew we shouldn't have if we haven't yet discussed being together officially, so At the 6th month, I decided to raise the legitimate question and he said we still needed time.. Then, he said that he was never a relationship guy and that he isn't wanting one. I was really confused and the whole situation felt disappointing. I still can't understand why would he do all that if he wasn't into relationships, why would he be so invested, consistent and everything else then? I was heartbroken so I cut contact with him, blocked him on apps but he's reaching me out by phone, saying he had a breakdown but no offer in sight. I don't understand him?
Guys, why is he acting this way?
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