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I think happiness is important but not just for you. Also for the person you are with. Think about how you both could be using the time apart to find someone who you suit with. Try and put yourself In their position and imagine how you would feel if it was them doing the same to you and they were only with with out of boredom rather than actually loving you/wanting to be with you.I feel you should do the right thing and be honest to save yourself and your partner hurt.

I feel somewhat the same, other factors as well.. but I definitely know how you feel. It is really tough