I feel fucking horrible. This other person lives 9 hrs away now and I havent seen them in a couple months but I still feel heartbroken about them.

Anyways I started seeing this new girl a month ago and its been great but it's hard for me to reciprocate her love. I feel really guilty about this cause I care about her and for all intents and purposes I should be happy in this relationship but im not and I know the reason why.

How long does it take to get over people?