I like the Korean lady a lot, but she is mad at me for dating the Thai lady. Give yourself a chance to grieve the loss of your wife, figure out who you are, and find out where you want to go with your life. But if you get married again too soon, you risk hurting the lady as well as yourself. I'm glad you're being straight with both women. If they can't understand that, it'll tell you volumes about their ability to love.
True love is patient and compassionate.
It gives more than it grabs. As for whether you should see both, choose one or stop altogether, nix that last option. But regarding how intimate you should be with one woman as opposed to lightly dating several, be your own judge of what's best for you. Despite my glib opener, no one knows better than you do about what's best for you. You can ask three psychologists and get four opinions.