It is. This type of love magick falls into the category of what’s called Coercion, or Manipulation, Magick. There is virtually no difference between this, and putting a spell on your boss so he gives you a raise. In both cases you are exerting your will over another to get what you want (especially if you aren’t actually worthy of that raise).
Problems arise because people have this high ideal when it comes to the concept of Love, and use it to look at things through “rose coloured glasses,” so to speak, so they perhaps don’t see the issues that broke up the relationship in the first place (get an ex back), or can’t see that the other person just isn’t interested (stalkers). It’s an “only what I want matters” kind of attitude, which is very controlling, ego driven, and narcissistic. They are not interested in actually fixing the problems, only dominating the other person.
Loving another person is supposed to be about caring about what makes them happy, and forcing them to love you through magick takes away that ideal because you are showing that you really aren’t interested in what they want, hence its coercive nature.
Forcing your “love” on another who is not so inclined, or has chosen to end the relationship for whatever reason, is the very definition of manipulation, and is, in fact no different than the behavior of those who use guilt or abusive tactics to make someone stay with them. However, few people who sling spells at their ex, or who want to get a specific person into bed, see it that way, though I’d bet the one on the receiving end does.
If you are targeting a specific person to act against their natural inclinations, whether it is for love, lust, a one night stand, or a promotion, it is a form of coercive magick. If you are doing a general attraction spell so that you can bring home a hottie for some naughty on a Friday night, or to make a good impression at a job interview, it is not coercive magick because you are simply augmenting your own energy (as well as doing the mundane things like dressing well, and taking care of hygiene, of course) to make yourself be perceived as more attractive, not actively forcing your will on another.
In the end, contrary to what some people believe, Love can be manufactured through magick, but when you use a coercive love spell to force that emotion upon someone, you will never know if the person loves you for who you are or simply because of the magick. That is the real difference between love through magick and that which is organically grown (also coercive love magick tends to be temporary and the other person’s true will does eventually resurface). In my opinion, it doesn’t really matter though, because if you are using a coercive love spell to begin with, you aren’t really interested in the other person as a person, only as an ideal or an object to possess, even if you delude yourself into thinking otherwise. That is why coercive love spells could also be considered curses.
Ultimately, it is up to the individual magician and their personal code of ethics. If you have no issues with killing through magick, then you most probably would have no issues with manipulating someone to love you through magick. It’s all the same.