To put up with- 
To overlook, or suffer without recompense, punishment, or resentment; as, to put up with an injury or affront
To take without opposition or expressed dissatisfaction; to endure; as, to put up with bad fare.

To need- 
1. A condition or situation in which something is required or wanted: crops in need of water; a need for affection.
2. Something required or wanted; a requisite: “Those of us who led the charge for these women’s issues … shared a common vision in the needs of women” (Olympia Snowe).
3. Necessity; obligation: There is no need for you to go.
4. A condition of poverty or misfortune: The family is in dire need.
v. need·ed, need·ing, needs
To be under the necessity of or the obligation to: They need not come.
To have need of; require: The family needs money. See Synonyms at lack.
1. To be in need or want.
2. To be necessary.

 

When i say need i mean it. i didnt say i ‘put up with you’ i said i NEED you.