But aside from that, there's no real, hard-and-fast rules about this sort of thing. No, if you want your significant other to actually grow with Christ you will encourage each other to regularly worship because you want them to: 1. I don't have the kind of space necessary to speak of the manifold benefits of sitting under regular preaching, but I'll list a few. At the same time, it's important to recognize that the corporate gathering of the people of God, in receiving the supper and lifting our voices in song, prepares and shapes the desires of our hearts to focus on God throughout the whole week.
Still, over the years I've come to see that there is key mark of a maturing relationship centered and continually centering itself on Christ: both of you are absolutely committed to each other's involvement in the local church. First, it convicts of sin and humbles us before Christ. If for no other reason than avoiding the danger of your significant other turning your own relationship (or you!
I've been working in youth ministry in some capacity for roughly eight years, and this is one of the most common questions I've fielded from young Christians: “How can (insert boyfriend/girlfriend) and I have a Christian dating relationship? ” As often I've heard it, I still love the the heart behind the question.
Realizing that practical steps matter, most often they want tips or steps they can take to build their relationship in Christ. (Protip: this last one is definitely not a winning approach.) At that point, one of the first things I usually tell them is that there's really no “biblical theology” of dating tucked away the book of 4:5-20. This can actually become a problem, especially because you're not actually married.
There are some rather obvious tips like praying for each other in your daily devotions, encouraging each other to read the Scriptures, setting appropriate boundaries (emotional, spiritual, and so on), and pursuing sexual holiness. These devotions together can develop into a couple-centered spirituality that begins to replace the church-centered relationship with God that the New Testament actually prescribes.
Indeed, I don't know a single godly couple who would tell you otherwise. We need to feast on this truth regularly, or we will be tempted to draw strength from other, lesser sources, like your own relationship. First, they do the negative work of preventing the greatest danger in any “Christian” dating relationship—no, not sexual sin, but the human tendency to make an idol out of the beloved.
Usually this idolatry justifies sexual sin and so many other relational pathologies.
Finally, we need to hear an outside word that we can't quickly rationalize, twist, distort, or ignore. If your relationship becomes the center of their faith, the main and only encouragement they have in Christ, something has gone wrong. All four stand on their own as solid reasons to be committed to gathering (and being a member of) a local body.