As happens with many romantic relationships, this one serves as a mirror of your lover's past. This could be an uncomfortable experience or an enlightening one, or both; but they can expect to have their past revealed to them in some surprising ways! Old, hidden hurts can be healed with the generosity and good will they find in this relationship.
If you travel together, the experiences you share while abroad or on the road further enlighten this person, bringing you two closer together while simultaneously deepening their relationship with and understanding of themselves. The only problem might be that they come to expect and rely on the positive energy derived from the relationship so much that they actually begin to take it for granted, or even take advantage of it. The danger with this is that they start to depend too much on your emotional support, and they end up feeling weaker when you're apart -- even though they were fine before the two of you ever met. They might delude themselves into thinking they can't do without you. And reality could intrude sooner or later, and they'll be really disappointed to find that you -- the person whom they've made out to be their emotional savior -- are actually as insecure and possible to upset as they are. For this reason, you should remind them not to allow themselves to become too emotionally dependent on you, even though their urge is to become close on all levels.