I’m a 27M & 25 F what do you think of this situation ? Any advice ? Very confused as a person.

I’m not one to talk about personal things but I’ve been going to therapy for my emotions and trying to open up more and my therapist suggested this if I come into any problems . I’m new to the relationship scene always been kinda just non relationship type but I’m trying to switch it up as I become older and more secure with life. I’ve been talking to this girl for about a month now we hit it off like it was destiny setting us up, right place right time. She even admits it is great. Everything was going great but she had just got out of a year long situation-ship. Where she was treated like shit and didn’t know what it was like to be treated good. So here I come along doing everything to just let her be herself and actually feel happy. Days go by we FaceTime almost every night but her ex situationship calls she hangs up and then calls me back and goes on to tell me I can’t do this anymore. Giving me the I’m still in love with him but I like you a lot but it’s not Fair to you for me to try to get over that while talking to you. So I’m like okay take all the time you need, a week goes by we don’t talk she hits me up saying I was just thinking about you and I hope everything is okay. We start talking but the conversation is different I’m here double texting waiting for her response but she isn’t as responsive as she was when we first started talking and it takes all day to just have a simple conversation. I’m stuck on what to do because I do believe this is the right thing that’ll work but then again I don’t want to be lead a stray and strung along even though I don’t think she is that kind of person. I’m mostly just confused towards the whole situation and what to do.