How did you get the downpayment to buy a house?

I recently got approved for a mortgage loan, and I've been looking at houses online. My fiance and I are bad at saving money. Our appartment is so shitty, and I can't wait to buy a house. We hardly have anything saved he just got a big check and was supposed to use some of it towards the downpayment but that didn't happen😑 He doesn't seem to care either way, but moving is my main priority and it's hard saving just from my income. Any tips on saving money? We honestly need to move asap! There's cracks in the doors and windows where we are staying because it's old, and there's mold in the bathroom😬 I can't wait to get out of here.

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