Will my collection affect a application if Im the second resident?

Okay my boyfriend and I have decided to get an apartment/house to rent. To make this simple:

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I have the higher income, higher credit score, BUT newer credit and a collection debt. I have tried to apply to places myself and get turned down for the debt.

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My boyfriend has never applied anywhere or lived anywhere but with his parents. He has a lower credit score, but more credit.

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I know he can get approved on his own, but we want to live together and want to avoid scamming, especially on an apartment since they are more likely to notice.

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If I am put on the application as a secondary resident...Will we get denied because of MY debt?

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Also, could I be denied to join the lease later?