Marriage  is totally  ur decision .No one can create  pressure  on u.So before taking the big decision  u have to think 1000 times.U have to be very clear  that u must love each other,u trust each other,u understand  each other.These are the pillers to support  any marriage. Forgiveness is an noble art.When u forgive someone it gives u immence peace .It is not an easy job. Feel free to contact again.

It is unclear. You think your fiancee is cheating on you? Well if i have got this right, that he has cheated in you and you are unable to forgive him. Confront him on this. Let him know that you are not okay. N now have trust issues. If there is anyway of working it out. If this is something you are willing to work upon, then sit amicably and talk about it. On the other hand, If you are clear that no matter what, you wont forgive him and dont want to marry him. The call it quits. Make a choice and deal with it. Being in two minds is like sitting on a fence which hurts.

I would want a little more clarity on the matter as a) who is asking you to get married (can you talk to them)or is there someone who is forcing you to do so, b) how was your relationship and c) what exactly are your expectations from your marriage.