I dated this girl for about a year and our relationship was 5 years ago. I have always had feelings for her even though she was the one who broke it off and she dated a guy seriously for a couple of years. But hasn't been with him for a while. We hung out for a long time at party over the wknd. I could tell she was getting jealous when my friends would bring up other girls names who I have dated since our relationship, yet she said I should call one of her friends that we would be a good fit. We spent the night with each other that night and she was the one being aggressive in the bed. I can tell she gets jealous in some situations but she suggested a girl I should date so I'm having trouble figuring out what that night meant. Thanks for the help!

Girls can be complicated, take it from one.
She won't have had sex with you if there were absolutely no feelings there, and she could have been talking about introducing you to one of her friends to see what you'd say, like to see if you'd go for one of her friends or if you were interested in her.
On the other hand, you said that after your relationship with her she dated another guy for a long time, and you have to consider that perhaps she is still hung up on him and went with you that night for comfort to make herself feel better.
Like most problems, the best thing to do is to talk to her, as you'll never know for sure unless you do.