A man can have substantial assets and still be ungenerous. Notice whether every shared decision becomes a negotiation, whether he uses money to control people and whether generosity only appears when an audience is watching.
Look beyond expensive gestures
A generous person respects your time, shares effort and gives without turning every gift into leverage. A stingy person may spend on status while resenting ordinary acts of care.
One frugal choice proves nothing. Watch the pattern over time and ask whether his values around money are compatible with yours.