Who is referred to as a true gentleman? Why is he in need of relief?

referring to

LORENZO

How true a gentleman you send relief, How dear a lover of my lord your husband, I know you would be prouder of the work Than customary bounty can enforce you.

PORTIA

I never did repent for doing good, Nor shall not now; for in companions That do converse and waste the time together Whose souls do bear an equal yoke of love, There must be needs a like proportion Of lineaments, of manners, and of spirit,