No love spells are not dangerous in general but sometimes they backfire on you because of the desire protection or other reasons (find more how do love spells backfire). In that case, love spells can be very dangerous for you. A backfire love spell can harm you more than a revenge spell. The feelings you are going to have definitely unpleasant and going to put you in trouble.
That is why I always suggest you think before what you are doing. Always take basic precautions of using a love spell and learn before start doing a love spell.
A love spell is not dangerous by itself if you are doing it for the right purpose. You have good intentions and you are good to go. Good intentions can bring happiness into your life and bad intentions can bring stress and karma towards you.