Learn German: Ich liebe meine Freundin.

In German, Freundin can mean either female friend or girlfriend. When you use the possessive word meine (my) before it, it almost always implies a romantic relationship. If you wanted to talk about a platonic female friend, you would typically say eine Freundin von mir (a friend of mine).

Why does the word for my have an -e at the end (meine)?

Freundin is a feminine noun. Because she is the direct object in the sentence (the person receiving the love), the noun is in the accusative case. Possessive words for feminine nouns in the accusative case always end in -e, which gives us meine.

Can I use Ich liebe to say I love my friends in a non-romantic way?

It is safer not to. The verb lieben is very strong and is usually reserved for romantic partners or immediate family. If you want to express strong platonic affection for a friend, Germans typically use mögen (to like) or say Ich habe meine Freundin sehr gern (I am very fond of my friend).