love magic is a grey area. 'help' others with your spell, you can, but both have to be willing and know what's going on. if one member in the relationship asks for a spell to keep the other faithful, or to spice up a dying relationship, then it's not helping because the relationship might need to end because there's someone/something better waiting for one/both of them.
willingly bring a lover to you? if the love spell you're casting is not directed at one person and you're visualizing your dream person and asking the universe to bring them to you, then it's ok. to cast over someone you like, then yes it's bad. but if you think 'i want someone who's just like Jonny Depp in Benny and Joon.' then you're ok, you are wanting a funny nice guy, but not jonny depp to come over and fall in love with you. [also, casting on celebrities never work, so i've been told but never tried.]
love magic, like all magic, needs to be thought about long and hard because acting on impulse can lead to disaster.