I think, like any relationship, there's certain signs. If he or she is unwilling to spend quality time with me, or if we always get into a fight about something, those are some red flags to me that something is wrong. If I sense my significant other getting frustrated with me, I'll book a weekend away, or plan a fun day where we just spend time together doing fun things we want to do. During that time often we can talk about the issues we're dealing with.