We do not find this doubt in the Norse teaching, but on the contrary, some very excellent advice.

The first thing to remember is that friendship is sacred: "He that opens his heart to another mixes blood with him." Therefore one should be very careful either about forming or about breaking a friendship.
A man should be a friend to his friend's friend.

But no man should be a friend of his friend's foe, nor of his foe's friend.
A man should be a friend with his friend, and pay back gift with gift; give back laughter for laughter (to his enemies), and lesing for lies.
Give and give back makes the longest friend.

Give not overmuch at one time.

Gift always looks for return.
The poet also tells us how trifling gifts are quite sufficient to make friends and to keep them, if wisely given.