<human>: Give me a shortened version of the text

So I have been dating this girl for three weeks but I am a little worried. For four years she's been "in love"with this guy. He's never reciprocated those feelings and they would mostly just hang out and have sex. In my mind hes used her. He took her virginity and never even looked at her the whole time. Anyways, they still talk. Maybe twice or thee times they've texted while I was with her. Also one night we were drinking and he called and she answered. Went into bathroom to talk to him and only got off the phone when I angrily shut the bathroom door. After that evening, she showed me all their past texts to prove that they were only innocent after her and I began talking and also that they text very rarely. 

It's still extremely early in the relationship, but I really like this girl. I don't believe she's the type to cheat, especially for the sake of just getting laid. I worry, however, that if they keep talking, what will happen if some day he decides he wants to reciprocate those feelings? She's told him she loves him, so he knows how she feels. He's just said that he's "too busy" for a relationship. What happens if he changes his mind? She swears that him and her are past and he missed his chance, but love is a hard drug.

What should I do reddit? How can we get past this? How can I avoid getting hurt? Is this a deal breaker? Do I just have to get over my jealousy/concerns?
<bot>: GF talks to guy she loved, worried he might decide he wants to try some day. Also get super jealous when they text or his name is brought up...