Following on from the op yesterday who hD a 5 year affair I believe you can love more than one partner at the same time. You love them for different things. I wouldn't recommend it though.
I've been with my dh since I was 15. Up until my early 40's he was my only one. Once I hit my early 40's a switch was flipped & I went slightly crazy. It was like it was some kind of teenage excitement I felt I had missed our on and had to get it out of my system. I fell in love more than once but never had any intention of leaving my dh. They were all secrets and knew nothing of my home life on terms of my families names or our address. I'm 100% confident they would not be able to find me on rl or on social media. It's been a few years now so I doubt they would even want to.
It's been a few years since the last one and now I could not be bothered to even think of having an affair. I just thank god I never broke up my lovely family or that I was ever caught. I'd rather live with my secrets than hurt my dh & adult dc than clear my conscience.