I fucked this girl last week. Then we went to a group hangout with some people I didn't know (but she did, to some extent). There was a cute girl that I wanted to flirt with. I did a bit but I could have done much more if I didn't feel a bit "restrained" since she was around. How do I remove this mental restraint?

Would it be better if I convince more to myself that girls being jealous is a good thing?