Breakup affecting my sessions?

You have tapped into the key factor that determines success or frustration with P Orgasm.... mental state. Anything that distracts you from the most trivial thing to the most significant will be a block. You stated it in your comment: DISTRACTION. Yes it happens to me often and I am a well seasoned practitioner. It happens to all of us. You are not alone. What to do? Meditation, long walks, porn, a vacation, dog walks .... do what ever you need to do to deal with the issue and your mind will clear. For me it was a difficult health issue I had years ago when I started. I got off to a very unsuccessful initial intro and had to put it down until I dealt with my issue. Once I was ok I got back on the bike (so to speak) with a clear mind. I use meditation, sexting, erotic writing and porn now to set myself up for success.

I read somewhere that you should avoid going a long time without a session because you can become "un rewired" is this true?

I'd believe that without returning to traditional masturbation and orgasms it should need a very long time to invert your rewiring.

When I'm too distracted I feel much better if I deny myself any session than having one half-heartedly.

Putting in my in-ear-phones and listening to some erotic hypnosis audio files often has been very helpful against mind wandering and other distractions.

Good vibes to you!

Mart