About 80% of boys in college fall in love for fun, and only about 20% for getting married later! Girls should play less, about 50% for fun, and about 50% for getting married later. The following can be calculated:

If 50% of unmarried girls meet 80% of unmarried boys, they can't get married in the future!

If 50% unmarried girls meet 20% boys who only talk about marriage, they will never get married in the future!

If 50% of married girls meet 80% of unmarried boys, they can't get married in the future!

If 50% of married girls meet 20% of boys who talk about marriage, it is possible to get married!

So the probability of getting married in the end is (50% 80%+50% 20%+50% 80%+50% 20%)100 =10%.