<human>: Can you provide a brief rundown of the text in within 3 sentences?

Her and I have been dating for a little less than 6 months.  Yes, we're young and yes, we haven't been dating that long but we both grew really close to eachother and have a close relationship for this short of time.  
Since we started dating,  there have been other guys that she has been in contact with but nothing that really worried me. She has always been honest for what I'm able to tell but she has been in contact with her ex's in a close manor. It makes me feel uncomfortable but I don't feel like I should feel this way. Ive told her this before. 
Recently her and another guy we're essentially sexting and she came upfront about it to me and described what happened. Since then my trust with her has been iffy but we remained happy together and got passed it. She has been in contact with the same guy since then. She has not text him in 3 days but he has nonstop text her and message her. His attachedness is concerning and the fact that she talks to him still is also concerning to me. 
She complains that I get too easily jealous and controlling since I tell her I get uncomfortable when she wants to hang out with an ex or random guys. I've never told her "no you cant do that"or anything passed saying that I'm uncomfortable. Is the way I'm feeling too much? Should I be concerned?
<bot>: gf talks to and wants to hang out with other guys, including ex's. I feel uncomfortable.  She thinks im too jealous.  What do?