Okay so you should tell Myra a few things in this order :

• You felt bad for Pat as he was still depressed after their breakup.
• You were not flirting, as you have a gf right now. You friendzoned him as clearly as possible by calling him "bhai".
• He probably texted Myra the "tell her to stop flirting" to make her jealous. It must have been a desperate and deplorable attempt to win her back somehow.
• Tell her you won't talk to him anymore, as he clearly is manipulating both of you.
• Myra should apologize for the slutshaming and the homophobic insults.

If she doesn't believe you, you can send her the conversation with Pat, and tell her to f*ck off until she apologize.

In the same time, you should tell this to Pat :

"Did you mistake my pity for interest ? I was never interested in dating you, i considered you my friend, no more, no less. You tried make Myra jealous, thanks to that i might loose my best friend, my girlfriendAND my reputation. I want you to apologize to me, and to Myra for your pathetic behaviour. Have a good life."

Then with your gf : she is an unfortunate casualty of Pat's manipulation. Tell her you only like/love her, and ask her if she wants to read the conversation. Whatever she choose, screen her the last message you sent to Pat.

Sorry this was long, hope this gives you ideas. Good luck. I hope thinhs with your gf will get better, and i hope Myra will apologize.

So she basically tells you that you are a slut, a disgrace, and that you should stay home (so she can make sure you remain pure until marriage i guess).

Ask her how exactly did she raised you, like, to be a woman, or to be a housewife ? Ask her why she told you that you are a slut, is it because you brought the guy into her home or is it because of the sex ? If because you took him home, then tell her that this way you wouldn't feel forced to do anything against your will. If because of the sex then she is a boomer.

You should move out as soon as possible. She seems to have a toxic mentality. You'll probably have to take a loan, especially if you are a student.