You
can be with them, you just have to be sure you're willing to deal with the potential drama.
Is it worth it?
If you get caught, is her man likely to act violently to either of you?
What if her man is cheating, burns her, she burns you, and you pass it to others?
Are there children/families involved?
If you're not worried about the aforementioned, keep doing your thing
Tradition tells us we should settle down and find that 1 mate in our 20s, sometimes 30s...
Realistically, were influenced by the media and they been showing us something different for a while now