Is it wrong of me to feel this way?!?

ok so ive been with my bf for four years and i love him to death!! i wanna move in with him and eventually we are planning on getting married..so anyways today while i was working at a diffrent store then my usual work place i ran into an old friend that i knew from middle school..im 20 now and i havent seen this kid sence i was 15 or so...but when i was in middle school me and this kid became really good friends and i eventually had a huge crush on him..nothing ever happened between us because he had a girlfriend..he knew i liked him and i think he liked me too..so anyways when i saw him today all those little middle school crush feelings came back..not like it would make me reconsider my current relationship or anything it was just such an awkward moment because he was talking to another employee about how he had just broke up with his girlfriend..and i dont kno why i started to blush and when he asked why i said it was because i used to have a huge crush on him back in the day and he just smiled...(plus he looks alot cuter then he did in middle school) lol but my question is, is it wrong for me to have gotten flustered seeing him today?!? it doesnt mean i still like the kid it just brought back those crush feelings again for a couple minutes..is it wrong of me to have felt this way even tho im in an extremely commited relationship?? nothing would ever come out of it except becoming friends with an old friend again but still..i feel like it wrong of me to have told him (even tho he prob already knew what i was gunna say) i had a crush on him...has anyone else ever had this happen to them and im i worng for feeling that way!?!?