Try reducing your frequency. I plateaued on almost all my lifts when lifting 6 days per week so I dropped to 4 days and every lift increased. Recovery is just as important as the work you do in the gym.
This is potentially it. If you are a novice lifter, three days of lifting a week is plenty.
Why?
Because you central nervous system is not up to much more than that unless you are unusual. And strength/swole training is as much about your nervous system as your actual muscles.
So accept your new beau swiped left for your as-is state and wind yourself back in for a bit.

Or ditch the "new partner exertions" and get at least 8hrs sleep a night, whilst eating everything you see.
And for the love of all that is holy: if you can't do a single chin up you don't deserve to improve your bench.
