Re: why play games?
I agree with the others. After some time in a safe, steady relationship a little flirting on the side can be fun. But as soon as it turns a little more serious lots of people will get scared off.
I don't know how old you are, but if I had a good friendship going with a 23 year old guy, and it turned a little more serious, then I wouldn't be surprised to find similarities to Mrs. Robinson....
Be happy that you had some fun with him, got to know a knew person who shared some things with you and vice versa, put it behind you and consider yourself a little wiser.