I’m pretty sure halachically speaking there is absolutely nothing wrong with dating more than one person at a time.
I did it, and only because the first person i was dating was already iffy to me and i wasn’t so sure. Turned down both in the end, but eventually got happily married.
Recommended? Depends on the person, if you think you can handle it go for it. It’s not really that hard, but it does become hard to really try and attach yourself to each other.