Can astrology explain this obsession?

Briefly speaking, the attraction is likely to be two-sided, especially if his planets fall in appropriate houses in your chart. Venus-Ur contacts along with various Moon-Neptune contacts indicate some deal of fascination on the part of both parties. But whether this is fleeting and idealistic really depends on the individuals. Ur aspects to the Moon and Pluto indicate that the relationship may be one in which frequent breaks are needed from each other. Upon first glance each may feel idealistically drawn to each other and fascinated by the unique characteristics that each seems to possess. But eventually they tend to get on each others nerves or become over-stimulated in each others company.