I get that this 显示 is mostly about couples, “ships,” but it is also about family. Maybe that is the point. He wants his family back because it is the only important thing of his immortal life.
The 显示 has done an excellent job of slowly building the trust between these two until that trust and mutual attraction could only logically be dealt with in a kiss, as it finally was in the end of this episode.
In a 显示 with bloody deaths every week, and compulsion and whatever other fresh hell rushing through town, I just don't think this 吻乐队(Kiss) is a huge betrayal. At this point, I wouldn't find a relationship between Elena and Damon a big betrayal.