If she's only staying for the summer, why would you need to move out?

Imagine you live with your girlfriend that you love and she is fucking somebody else and you can't say a word.Same feeling for me(although she is not my GF).Unless I can change the situation.

You've known this girl for a week. She moved into your house. And now you're thinking about moving out because of her? You're coming off as really unstable and insecure and I have no doubt that this girl sees this. This is the first thing you need to fix if you want to have any chance with this girl.

What do the other roommates think about this? You said you have two other roommates. Since this girl is new to the house, the two other roommates must be your friends. Have you tried asking them what their opinion on the situation is? They might be better equipped to give you advice since they are able to see both of you in person.

Hi guys,
I've had a small talk with her today. I've been trying to ignore her but I can't ignore her.
I don't have a girlfriend now and I don't like the whole concept of roommate that causes this problem for me.
My past week was not great and I was not productive.
I want to talk to her and tell her I like her. Guys, do you think because of living together, I can influence her by telling my emotions. I think girls are responsive to emotions.
Even I was thinking of crazy things like hiring an escort to come to my place to make her jealous or something like that.
This feeling sucks and I don't want it to ruin my life.
Guys if you have any suggestions, I would be grateful to share it with me.