It's important to note that "Freundin" can also mean "female friend", so context is important to understand the meaning.
Here are some examples of how to use "Freundin":
* "Meine Freundin ist sehr schön." (My girlfriend is very beautiful.)
* "Ich habe eine Freundin." (I have a girlfriend.)
* "Sie ist meine beste Freundin." (She is my best friend.)
You can also use "Liebste" (pronounced "leep-stuh") which means "beloved" or "sweetheart". This is a more affectionate term and implies a romantic relationship.
"Partnerin" (pronounced "part-ner-in") is another option, although it is more formal and can also be used to describe a female business partner.