I think this is worth a read on singleness, whether you’re single or married. I thought this section on families and singles was especially helpful:

The purpose of family is not only to be a blessing to its members, but also to be a blessing beyond itself. One of the major ways a family can bless beyond itself is by treating those who are outside as though they were inside. This, more likely than not, will require initiative (i.e. it won’t happen accidentally), and that initiative needs to come from the families, not the singles. Families in our culture generally don’t feel strong, but socially we are in a position where we can invite others. Our invitations need to be extensive and habitual. For example,

* We could invite people into our homes—not just occasionally, but regularly. I’m sure there are many who would love to share a weekly meal with a family.
* We could invite others to come on holidays with us.
* Perhaps we could consider whether we could have others live with us. If we can’t do that where we live now, perhaps we could consider moving somewhere else where we could.

In addition, couples need to give each other space to build quality relationships with single people. At this point, it is worth taking a small detour to talk about how to relate to single people of the opposite gender. Paul counsels Timothy to treat “younger women as sisters, in all purity” (1 Tim 5:2). Most Christian men have a predisposition to read just half this verse—that is, as either “treat younger women as sisters” or “treat younger women in all purity”. Men who do the former imagine that the distinctions of gender are no longer significant, and so relate to women as though they aren’t married, or as though the women are actually their biological sisters. Men who do the latter (which is more common in Christian culture) imagine that they can completely ignore women in the name of purity.

But both are wrong. Paul deftly avoids allowing me to deceive myself into thinking that there is no difference between my sisters in Christ and my biological sisters. But at the same time, he tells me where to get my cue for how to relate to my sisters in Christ. So I would not, in the ordinary course of events, hang out with my sisters in Christ without either my wife or their husbands, even though I would happily do this with my biological sisters. But I will offer lifts, I will have conversations, I will exchange the (occasional) email or text, I will give the (also occasional) hug, I won’t leave the house immediately if I come home and find that my wife has ducked out to the shops while a female friend minds my children, and if I could fix cars, I’d happily go over to a single friend’s place to spend an hour or two having a go. I think I can do these things without running the risk of unfaithfulness and creating a ‘hint’ of sexual immorality (Eph 5:3 NIV).