Call him sadist, he won't care.

What he care the most is that he should find his another half.

Call him crazy.

Even if he need to sacrifice something to make them together, he will just do it.

Call him obsessive.

Because it just one person that is what he really need.

Even if his another half is not love him back.

He don't care because he can make his another half to fall in love with him again.