I need advice on how to approach this!

SO ran out of money this month for a few days before his next paycheck AND I maxed out his credit card because I ordered a pizza for $20! I love him and am not with him for the money, but this should NOT be the case if you knew his salary. 

Some background- SO and I moved in together about 8 months ago. He has been divorced for 6 years and has a daughter, fsd7. He does not pay child support (joint custody) however, when we moved in together he had NO money. I mean he had maybe 3k to his name. This was because he stayed in the house he shared with ex wife who was once sharing the expense with him (we live in an area where it is very expensive to rent so he wouldnt have been able to find somehting suitable for his daughter) however, his mortgage eventually went underwater. I was disgusted by the whole thing and basiclly forced him to do a short sale and we moved into a beautiful apartment that has a bedroom for his daughter, and its saving him a LOT of money per month. almost 9 months later he is running out of money for a month and maxing out his credit cards?? This whole time I thought he was finally able to be saving and paying down his credit cards. It feels selfish, but I really want to get engaged, married and pregnant within the next few years and I am so disheartened that my SO has nothing even though he makes a decent salary with good benefits and overtime. I make a little less than him, and I manage to save every month and keep a very low balance on my credit cards, so why can't he? 

My question is, am I allowed to confront him about this? We are not engaged or married, so I feel like I don't have the right. However, I am curious as to what his other expenses are that I'm not aware of. I know that he pays for all of fsd7's "school bucks" (lunch money) instead of splitting it with BM and he will do other things like buy her brand new dance shoes or soccer cleats even though he splits the registration fees and everything else with BM. Am I unreasonable to insist that BM pays for half of the shoes or lunch money? Do I have any say in this manner? His current financial situation makes me insecure about his ability to provide for me and my future children

Advice please!!!!