<human>: My boyfriend is on an extended trip away (2 months). I've been having mixed feelings about the relationship for a long time, and now that he is away and I don't miss him like I know I would if I really loved him, I feel certain that I need to end it. 

He is a very good person - no feelings of spite here. We just don't have interests and priorities that align, and it seems that things may have run their course and it's time for both of us to move on.

I hate the thought of having this conversation over the phone instead of face to face, but is it worse to keep this from him until he comes back?  If I end it over the phone while he still has a month on his trip, does that ruin his trip, or make his 2nd month away a good time to be with friends, have his freedom back and regroup? 

If I end it when he comes back, then at least it would be face to face, but is having the convo face to face worth pretending the relationship is okay until he's back?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Do I break up over the phone midway through his 2-month trip, or wait until he comes back to break up face to face?