Every time you fall in love, you're sure that your sweetie is peerless, deathless, matchless -- at least in your mind. You fall too far too fast, and likely you've gotten attached so very quickly in the past due to feeling an overwhelming amount of physical attraction. You cherish what time is given to you in each relationship.
Notice the syntax: the time given to you. Not the time you spend together, because you tend to rather be involved in rather unequal relationships: You want far more than does your partner. You may have been too swept away to notice which of you called the other more often, or who wanted to hang on when the other would rather spend some time alone. In order to achieve successful relationships, what you're going to have to do is compromise. This will require careful attention to the signals your ideal lover will give out. Discuss what you each want from the other. If your needs are vastly different, is there a way to meet in the middle? If you want your lover bad enough, you'd better find that middle ground. You'll get less than you want, perhaps, but you won't lose everything -- and with the lusty connection you'll have, that's a lot.