How do you know if a girl likes You?

Theres this girl who is giving me all the signal shes interested in me. She stares at me with a smile on her face, locks her arms with mine hangs out alot with me is always laughing at my jokes and always calls me when she's bored or needs company she even signed up 4 sum of the cles i did next quarter the thing is that she recently got back with her ex and but she still wants to hangout with me I would luve 2 ask her out but the whole boyfriend thing is killing my chances does she see me as mor of a friend or a potential boyfriend this whole situation gots me confused idk what 2 do any ideas anybody