Relationship boundaries?

My girlfriend and I are planning on setting some boundaries for our relationship. Physical boundaries are easy, we both have ideas about what lines can’t be crossed. But we’re interested in other boundaries. Does anyone have any experience they’d be willing to share? For example, I want to set limits on how much time we should spend together. I’d personally like to be with her all the time, but that’s not healthy and could smother her. She’s kinda the same way. We need to set some sort of limit on that, but don’t know what to talk about. I’m thinking, we need to set limits on how emotionally involved we are, how much time we should spend together, maybe how much money we’re allowed to spend on each other per month or something. Any input is very appreciated.

Just for the record, this is a Christian relationship and we both feel like I should lead the way in the relationship because I am the man. Ideally I should never be asking her to do something that she deeply disagrees with, because I should only be asking her to do Christlike things.

On that note, I’d ask that you not respond to that specific issue. please keep the responses positive

And because I’m sure it will be asked, I’m 20, she’s 21.