In my case, I've went through a few partners: 2 walked away and 1 have said that they're interested in learning but the time commitment is tough. Some people just aren't willing to put in everything that's required without really knowing that there's something in it for them.
What I've decided to do then is to take the lead and steer the ship until we hit revenue. My partners all have a full-time job so I can understand that putting extra hours in for something that may not turn out great is tough. That being said, I do appreciate their help.
In your case, is your partner willing to take a step back and let you guide things? It's important for you to be completely transparent and clarify things. If he's in, how in is he? What can you get from him and what do you need to give up for his help? Can he help you? Have that talk. Time is of the essence for a startup and you can't afford to keep things dragging along. Your family needs you.
Regardless, my understanding is that we're entering a dry period for capital in the tech business right now and investors are pulling back from tech startups in a big way.
If this is true, VCs are going to raise the bar quite high. A few years ago just the fact that you are in 2 different countries would be an automatic disqualification for many investors. And they can clearly see that not only are you collaborating remotely but you sourced someone and more or less put them in the driver's seat as your bizdev proxy.
I suppose the outlook was a lot more rosy back in Nov but it's frankly surprising that they even let you in the door in the first place. The investor gave you a very clear rational reason for backing out.
Your CEO's passion for your business isn't something you can force either. They see the risk as well. Unless your product is just mind blowing, which maybe it is given the interest, you're not going to raise money easily with this configuration.
You have a high bar in a difficult time, and a limp partner is the last thing you need. So yes you need to address this head on. Hopefully you can regroup, bootstrap a little longer and try again when you're on firmer ground
As far as how you should go about handling the situation, I'm afraid I can't offer too much help as I do not have any experience in this situation. However, I do not think it's unreasonable for you to be pressuring him to call your raise and carry his own weight. The best advice I can suggest is to probably straight up talk to him and explain your concerns. After all, you guys are founding a company together, so you should be able to have discussions such as these as if it's your spouse.
Good luck mate