If that person is a gentleman ,I can name him : so nice spouse :-)

Open-handed

I don't know of one adjective which exactly describes such a person. Have a look at "spendthrift" in the dictionary.

From the Oxford Dictionary of English: extravagant adjective lacking restraint in spending money or using resources: it was rather extravagant to buy both. • resulting from or showing a lack of restraint in spending money or resources: extravagant gifts like computer games.