Well... it would be unusual for other people to show interest until you're making money or demonstrating how it can be done. Even if you have a great product changing people's patterns of behavior is very difficult.
The upside of this is that once you ARE making money, you'll find it becomes a lot easier.
If you don't think your partner is pulling their weight, the first question you should ask is whether you're being realistic/fair in your expectations of them, or whether you are looking for someone to blame for some perceived failure. Your post suggests that your partner is - in fact - doing most of the core development work. In either case, bestes is dead right - you need to clear your expectations with your co-founder.
If you need money get a part-time job or let one of you focus on trying to get funding while the other continues development work. Marketing is going to take a lot of effort, and if you're complaining about not having money for development it makes me wonder how you're planning on getting the word out to prospective customers.