Step mommy’s, I need help

How do you cope with the woman of your SO children? How do you tolerate her and move forward with her if she’s created so much drama? I’m having a VERY hard time tolerating this woman for many reasons. She’s been pure jealous of mine and my bfs relationship, caused drama, threats, lied and use the kids to try to get what she wants and so much more. Just how do you deal with a woman like that when it’s your bfs kids mom?

Note him and I have been together for a year and we’re now expecting our first baby together. Just looking for some advice because the inner me just wants to snap and go the F off on her but clearly that will do no good considering I want what’s best for the kids. Lol