The fact that nothing just happens. All the pleasures of life sooner or later require a reckoning:
1. You're in love. Yes, exactly, and if you think that this might be mutual, then nothing like it. Mutual feelings and strong family informed of the available relations is obtained only in 2-3% of cases. A little bit, isn't it? Now think about what will feel when he heard: "You make me sick. Let's finish?".
2. Incurable disease. What do you want? Your sexual partner free, sex with other girls is not prohibited. Who knows what he picked up?
3. "All life is not that man." You finally sprung for the family, but suddenly it turns out that your partner are satisfied with everything. Why ruin something that took so long to build, and to be honest, that did not require much effort? To find a new lover it's late, have to settle for what was available.
To save yourself from such unpleasant situations, it is time to consider whether to waste his life this way. The phrase "in the world of normal men", "I love this person" are fictional, they live only in your head. Have you ever tried to walk down the street smiling and looking around? Practice proved that we just don't notice anyone, plunging head first into their problems. Be open to the world, and the world will be opened to you!