Guy's Behavior

What could be the reason of my guy friend's behaviour?

Hey guys. So kind of a weird story. I started using Tinder like a half year ago. I've had talked to a lot of guys, but haven't met any of them, because I was pretty insecure. Except for one guy, who I've had been texting and calling with since July. Anyway I felt different with this guy and he totally made clear he liked me, so we met like over a month ago. Weeks before our first time meeting, texting got really intense and he confessed that he started to have feelings for me. After we met I didn't feel anything romantic, but he said he did. So I started to overthink and decided to give it a try and see what happens. Then after a week he started acting differently and in the end saying he lost feelings for me. I asked him several times why he suddenly lost feelings and if I did something wrong. He said I didn't and it has neither to do with my looks or my character, it's just that he decided he wants time to himself, but still be interested in staying friends. I know it's kind of mad staying friends but I decided to roll with it, although I had feelings for him (he knows). After some arguments between us both, because I was hurt and analyzing why he changed his mind, he said I needed to make up my mind, if I could stay friends. After a while I started being chill about it and we talked casually and without any stress. Now that I've started getting to know other guys, he starts saying I shouldn't expect much and be cautious or I'll end up hurt again. And I shouldn't date because I'm probably not ready for it. He totally isn't supporting me and trying to talk me out of meeting other guys. What's up with that? He clearly doesn't want a relationship with me, but is telling me I'll end up disappointed again. If he is my friend, why does he imply I'm the one making mistakes in dating and saying "your throwing yourself from one desaster on the next". He seems kind of jealous lately tbh. I can't explain, cause he doesn't want me. Why do you think he is having a dig at me?
What could be the reason of my guy friend's behaviour?
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