We want to emphasize how much we mean just a 'little' jealous. The kind where she starts holding your hand and getting really close if she senses another woman is after your attention. A strategic kiss to show everyone in the room that you're hers. That kind of cute stuff. There's nothing wrong with loving someone and wanting to get the message out that they're taken.
The kind of behavior we're not talking about is crazy stuff, such as throwing a drink on a woman she suspects is after you, sending angry texts or calling people she perceives as a threat, or constantly making like difficult for you whenever you're going to be hanging out in a group that includes other women. That definitely isn't love and we'd encourage you to have a talk with your lady if this is happening.