You can not marry someone just because of that reason of him being nice to you . You need that connection and a love that is unconditional. A lot of guys are nice, but a lot of guys are mean. You have had your fair share of encounters with men, but that doesn't mean you should go out and marry the first guy you meet who's nice just because he's nice to you.
That's just not realistic. If you want a marriage to last, there are many factors that go into it. Yes, being nice is a good trait to have in a partner, but there are other things you should base your decision on before you go running to the altar!

Marriage is never about "should" or "shouldn't." It's a choice, and the consequences for making that choice are going to last for the rest of your life. Marriage should be a voluntary action where two individuals have agreed to accompany each other with compassion and love until death sets them apart. When a person has committed that he/she wants to marry someone, he/she has to take full responsibility for that action and be ready for the consequences later on. If someone prefers to be single for the rest of his or her life, then so be it. You live life to enjoy it.

God gives us great freedom in choosing whom we'll marry. So, marvel at the fact that God has spoken to us through sending his beloved Son, accept that word as enough for you, and then wisely choose whom you will marry.
May the grace of God grant you wisdom to choose wisely.