Am I wrong to want to do this?

if you remain in contact with your old love then trust me these feelings of wanting to see him will grow stronger... after meeting you might tend to change your thinking about fiance... if you dont want to hurt him or leave him then avoid contacting your old love... this is what best option for you yet it is going to be harder for you... see its emotional and you cant control your feeling towards your love just by meeting him again.. its just going to make your wishes and desires grow stronger and stronger... and just think what if your fiance comes to know about it .. he'll lose that trust in you.. its ok that you talked and all memories came bck.. now stop it here and talk to him about stopping these contacts...