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Freund and Freundin may refer to either a platonic friend or a boyfriend/girlfriend. In general, "mein Freund" (my friend) refers to a boyfriend, whereas "ein Freund von mir" (a friend of mine) refers to a non-romantic friendship. Similarly, one might refer to "meine Freundin" for a girlfriend or "eine Freundin von mir" for a non-romantic female friend.
In the case of non-romantic friendship, the German word is closer in meaning to the English expression
close friend than to
friend in colloquial American English.