Is it considered stalking?

If you just get married to someone but you fall in love with another who you just want to be friends with but they can't make up their minds one minute they want you the next minute they dont then they do again and follow you and sit off in the corner crying because you married someone else, would you chase after them and let them know that you really do love them if you really had feelings for them or would you let them go? Besides you just got married?but you really could use a friend.