Need advice

So, I'm a Scorpio woman with a Capricorn BF. He is super patient and understanding...for the most part.

Our relationship is very serious. We have only been dating for about 5 months, but we knew each other before. I am the first girlfriend he has ever told his family about and they love me. My family loves him too. Everyone knows that we ultimately plan to get marrried, but we just wanna give it a little more time first and prepare things, plan, make some money, the normal stuff.

In his culture when you say you want to marry someone, it means you are completely committing to that person forever. So I take him pretty seriously, and for the most part his actions have proven to me that he is serious and he loves me. 

But occasionally he will just change his mind about plans that we have. Not plans for simple things like dates, but relationship goals and plans that we set. Most of the time it's for the good of our relationship and I understand that, but I'm starting to feel like I don't wanna get excited to make plans anymore. 

For example, he absolutely forbade me from telling most of my friends about our relationship. But a few weeks ago he told me he was finally ready to make our relationship public. I'm an impatient scorpio, so when he finally made that decision I was so unbelievably happy and we planned a specific time to for it, because that's how he likes to do things. Not right in the moment. 

So today, he had a conversation with someone who told him that he isn't ready for a serious relationship because he has too many other life goals (which we are currently working to accomplish together). After that happened he told me that no person can change his mind about me. Then he went on to tell me that he doesn't wanna go public with our relationship and he doesn't know when he will want to in the future. He said it's not just because of a fear of people's reactions but I know it is. 

I'm just wondering... do you guys think he will change his mind or do you have any advice?? Do we still have a serious relationship?

I just feel tired because recently he has changed a few plans without considering my feeling. I talked to him about it, but he just keeps saying, "Why do u need to tell everyone? We can just keep everything between us, that's fine. I'm good with that." 

I know he is good with that, but I'm not.