<human>: Summarize the given text in a few sentences.

Hi Reddit! I am buying a home for 300,000 with my name on the lease (due to boyfriend's lack of good credit). We currently have separate finances. I am putting down 90k and the boyfriend is putting 0k down. We would split mortgage payments 50/50. How should we work out costs if:

1) Someone wants to leave the house/relationship before sale?

Or 2) if we sell the house together but want to go our separate ways after sale?

Or 3) if we continue to stay together as boyfriend/girlfriend after sale?

Also, there might be a potential 3rd party that would live with us and just pay rent.

Let us know what you think!
<bot>: I am putting 90K down with my name on the lease, boyfriend is putting down 0k. We split mortgage. How do we make this amicable if we break up?