<human>: So, we've dated before. We dated for a little while when I was 19, he was 22. I was a lot more naive then. But during the course of that relationship, I went on a trip to NYC with my family for four days and when I came back he was acting totally different, broke up with me within a week and was back together with his ex three days after that (on Facebook and everything) and while I was in NYC he went to a concert with her, so there's pretty good evidence he might have cheated on me. 

We started seeing each other again in late February and things were going really well. I was more mature and he seemed to be too. But, I have concerns because I've seen his ex's name pop up on his phone texting him on a semi-consistent basis. This is the same ex he dumped me for last time, too. I don't read the texts she sends. He makes a pretty conceited effort to not open them in front of me, but he accidentally did the other day and all I caught was "We still on for..." 

He's been really stressed about his job lately and has had some problems with money. But the other thing is we haven't been intimate like we used to be either. He always has some sort of excuse like he's tired or not in the mood.

Can you summarize the given text in a few sentences?
<bot>: Guy I've been dating has been texting ex girlfriend, possibly hanging out with her. He's dumped me for her before. Been acting really distant lately and I dunno what to do if he won't open up to me.