When is too much?

Okay...I'm not going to even post a long blog because this devotional got me this morning. I know that we're supposed to be like Christ and the "12 dudes" lol, but honestly...what if time and time again you give of yourself, you're there when people need you , you always lend a helping hand, you're kind and washing just about everyone's feet you know...but you continuously get hurt because you don't get the same in return? Somewhere in the word it is, "Don't grow weary in well doing because in due time you shall reap what you sow." But what happens when you get tired and weak because all the feet that you're washing aren't washing yours back?!? And I know that you don't give to receive or do to have done, I'm fully aware. But to be real "faithful friends" this is the exact topic that had me down last week...I really don't know when enough is enough or how (or even if I should) place myself in different positions in my love ones life b/c of the way they make me feel...

Please help me out....

RJ