How can I approach my professor when he is sending me indirect messages with another person?

After achieving my masters degree, i applied for a phd program at the same university i was graduated from. In Germany, a person has to find 2 advisors to be registered as a phd student and thats it for the begining.

I approached a professor whose area is related to my research.I told my intention and research idea to him and he said he would like to be my advisor but he officially cannot be the first advisor due to the number of students he already has. Instead, he suggested that he can be my second advisor and i should find another professor as my first advisor, in this way we can continue working anyway.

I decided to approach another professor (who is also a colleague of 2.advisor) and I asked him if he could be my first advisor and he accepted. We have exchanged more than 10 e-mails, talking about my proposal. When he came to my city, we met and everything looked fine. I continued to work on my proposal and sent him after a while. I needed to get a reference letter from him, as I am applying for potential scholarships. Some of these scholarships demand the reference letter to be sent directly by the professors. He has written the reference letter and wrote me an e-mail saying that he has sent the letter to the grant givers i asked him to send. I have asked him to send the letter also to me as a pdf, since i need to upload it personally as well. He has not send it to me and since weeks he is not replying my e-mails.

Instead, he has sent me an indirect message with a friend of mine (also a student of his), saying that I should work more on my proposal and it would be difficult to get a scholarship with such inaccurate proposal. He told her that I have been rushing to finish it and I should stop and reconsider my steps. He also added that, due to the inner conflicts he has with the faculty, he will be resigning in two years so maybe i should consider to find another first advisor as well.

I found this indirect communication unusual, disturbing and i must say, unprofessional. I decided to send him another e-mail, asking him if he can approve what I heard from my friend so that I can begin to search for another first advisor. Because if he officialy does not write it, i'm still registered as his student and it would be awkward to search for another one while I still have one. He is not replying to this e-mail as well. I have been applying for another scholarship meanwhile (only with one reference letter which is from my second advisor) and today i recieved a note from this scholarship, saying that my file has been taken under consideration but i should send the other reference letter as soon as possible.

My professor is literally blocking me from applying further. I have understood what he meant by taking more time to focus on my proposal but for now I need this reference letter from him. It just doesn't make sense that I cannot have the letter when it is already written for me. My question would be, shall I contact and ask my second advisor about his opinion on this situation or shall I take a step back and wait for my first advisor's conflicts to be cleared and hopefully he writes back to me?