It terms of sex:
Love: Slow moving, candle lit, music playing, on a blanket, under the stars sex
Lust: Fast, hardcore, roleplaying, chain ya to a wall sex.
If infact two people are in a healthy realtionship/in love...both can be equally heathly to their respective realtionship. (Both physically/emotionally)
Now as far as mentality goes, many people,(usually younger) confuse love with infatuation/raw emotion. The thing is love cannot really be defined, although some of us can each give their own perspective on it. Usually love is self-sacrificing, careful but intelligent, most importantly forever. Usually something like this is refered to as the "soulmate". Another thing is, if you ever have to question if your in love with somebody or not...for any reason, then 9/10 your not in love. That being said, you can love somebody and still have it fail later on, due to a number of reasons. Lust as Sfalexi stated, is usually a strong sexual desire based on looks.
That begin said, I hope this helped you understand the differences a little.
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