Welcome to our forum.
I can sort of see where the others are coming from, as far as, it's okay for you to be involved with a new woman, but not a new man. Plus, people can rarely be sure that a new person will be equally in love with both of you, and may only be in love at all with one of you.
That said, I will add that the most important thing is what works for you. You are your own person; all your relationships will be unique. Just be careful, I guess is what I'm saying.
Glad you could join us,
Love means never having to say, "Put down that meat cleaver!"