This girl is messin wit my head, but i like it. what should i do?

i had this special friend. she wanted me to hook up wit her. i waited a while cause i didnt wanna be her man i just wanted to keep bein f***buddies. but i eventually hooked up with her cause she was a really cool person. but it turns out she had another boyfriend. i didnt really care but i started to love her. i felt really weird. like i had a sledge hammer slammed into my chest. i like the way it feels but i dont know if she is F***** him to she says she didnt. She told me she was pregnant and i was the dad, then she said she wasnt. this girl is crazy. should i still mess around with her or call it all off?