Hi, I can share with you my experience, but there is no one rule applies to all, only time will tell.
I had 2 girlfriends and 1 wife in the past and they had regular sex affairs with other men and I was completely aware and ok with that knowing that they were used to bigger cocks than mine. Well, to answer your question:
1) I was a cuck from my first wife that was really sex addicted, she left me to one of her bulls
2) My following girlfriend cucked me and we never had problems, both were happy, until she became a lover to her manager from a Company that was quite close to her house. Well, needless to say that she was much more with him than she was with me, irmally during the weekends. To make the long story short, her married manager convinced her to leave me and continue as his lover, which she did….a king of Sugar Daddy.
3) My third girlfriend was used to big dicks (mainly black guys) and she never hid it from me from day one of our relationship. She was a BEAUTY, she could be easily a model, so the easiest thing in the world would her to pin point any men she wanted to have in her bed., not that the other two weren’t, from that aspect I was lucky to always have a sexy girl with me. Well, this girlfriend liked me as a person, not as a man in bed….but I was far away to be able to satisfy her, so I confessed her my previous experiences as a cuck and suggested her to cuck me, which she did. We were together all along where she had sex with her bulls and made me happy normally with a handjobs or sloppy seconds. Unfortunately she moved away and our relationship had to end, but not because she left me due to a big dick.