<human>: I'm M23 and my ex is F21 we were together for 3 years. Basically I'll start at the beginning we broke up in October and stopped speaking for a few weeks then during November we started texting and seeing each other then in December we started sleeping together and telling each that we loved each other and regretted breaking up, we kind of agreed we were back together but not officially but we was saying things that kind of told me we weren't seeing or going on dates with others.

My problem now is from December to April I found out she was seeing others and going on dates. From what she finally told me, which took along time to get the truth since she lied about the stuff a few times, in December she went on holiday and kissed a guy, then when she got back she created a dating account and kissed a guy from there, she was also texting a guy she met and sent him a picture and he sent her one, then in January she slept with her ex which I found out she was texting since late October, she also went on on a few other dates with a guy who she kissed. She was also keeping her dating account and messaging people all this seemed to stop round about April when I first found the dating account and it's took till now to get the truth or what she says is the truth. 

Now you can say we weren't together properly which I completely understand but my issue is the lying and she admitted to me that if I didn't find out she would of carried on flirting on the site. 

My question basically is what should I do, if I stay with her do you guys have any advice on rebuilding trust and Any people in the same situation have any advice. Thank you.

Give me the gist of the text in a nutshell
<bot>: My ex and I got back together we was saying lots of coupley things and it turns out between December and April she was seeing and texting other guys.