Understand where he is coming from, trust is built over time and you guys are a new date.

This is very bad. The relationship is not truly established, but he already tries to keep you away from your friends because of his issues. If you allow him to do that, then he doesn't need to work on his issue and will just block you from your friends to make himself feel good. This is extremely selfish of him even if he doesn't realise that. If he cannot work that out he's not fit for a relationship.

This isn't an insecurity you can change or deal with. It will eat away at everything that makes you who you are until the only friend you have is him.

You live your life. He either trusts you or he doesn’t. It’s not your job to prove to him you’re worth it. It works or it doesn’t.

Set good boundaries. Make it clear to him that its normal for you to have friends and privacy. You should not feel the need to defend yourself all the time or explain what you do. He may not be ok with this, if that's the case then he isn't ready to be with anyone.

Just tell him, unless he starts trusting you, it's over...unless you sort it out now, it will get worse ...

I get it. Been there, but you are not her. He needs to step out on a limb even if it's a little bit