Should I confess to my long-term partner that I’ve slept with another woman?

DEAR DEIDRE: ALTHOUGH I’ve never been the unfaithful type, I recently cheated on my long-term partner.

Should I be honest about my infidelity? All her previous partners cheated on her, so I know the truth will break her heart.

The last time we had sex was awful. I lost my erection halfway through because she just wasn’t turning me on.

I blamed it on being tired.

I’m 38 and she’s 35. We’ve been together for two years.

Our relationship was wonderful at the start...