I cant stop thinking abt my ex-teacher..wht will I do?

When I was in cl 7,My maths teacher was a college guy.He was the only one who understood me nd we shared everything..He was very introvert bt shared his feelings wid me.He left the tution when I was in 9th nd b4 leaving,he told me tht he loves me.He's 11 yrs older thn me.I'm too much emotionally attached 2 him.It has been a yr since he has gone nd I'v last seen him.Still I cry 4 him at nights.I'm nt being able 2 4get him.He's 27 yrs nw nd is going 2 marry nother girl who really loves him,after 3 yrs.I understand everything nd is happy 4 him bt still it hurts a lot.I dnt knw wht 2 do.Pls help...