1. The "one ... his" pattern is old-fashioned and probably offputting to modern readers. In formal English I would say "one ... one's". Informally it would be "you ... your".
I should perhaps mention the potential ambiguity of the "It is indeed risky to fall in love because ..." phrasing. It can be understood in two ways: the way you intend in your sentence, and the way exemplified by, say, "It is indeed risky to fall in love because you are lonely". Personally I feel that the meaning of your sentence is clear enough, and that there is no risk of misreading, but opinio