After a certain point in spiritual development or 'growth', the aspirant begins to be more careful about the 'energies' they connect with. Their own way of seeing it is a bit monastic. Monks and nuns withdraw from the world, avoiding socially intense situations. In more modern times, we hear of meditators 'withdrawing into their own space'. The need to defend one's self from verbal assaults, and to avoid those who aren't like-minded gets more intense.
Practitioners become more 'open-hearted', and along with it, more vulnerable.
Few romantic relationships escape unscathed. If one partner begins spiritual practice, and the other doesn't, they may soon find that the level of intimacy that's comfortable for each is now different. Of course, the now-spiritual partner has a new set of interests, and that tends to divide two partners. The practitioner can feel that they've 'outgrown' the relationship, while the one who's not doing practice might tend to blame the group their partner joined, or to feel that their partner has taken religion 'too far'. In fact, one study of TL epileptics found that they were more likely than others to undergo multiple religious conversions.