<human>: 25/m and 21/F

Dated for a year then she fell for the lies from another guy 400 miles away and left me for him. After that went sour, we started talking again, this lead to us deciding to try being in a relationship again. During the time we started talking she ended up in a relationship with another guy, who she says she has nothing for..... Last Monday she told him she couldn't be with him anymore(dated two weeks), never stating she was talking to me...just trying to let him down easy. The guy has been obsessing over her, sending her 20 messages a day, calling all the time, she has been ignoring it while I am around but I still have wonders of what she says to him when I am not. I know he knows about me, and I'm sure he has his suspicion that we have been fooling around and hanging out. 

How do I tell her this is bothering me without sounding like a dick? I mean this dude has been really pushy, and she has been pretty patient with him at least when I am around telling him to move on and such. 

Just a side note, She basically made me stop talking to the girl I was fooling around with before she started talking again, stating me and him are friends, not just fuck buddies like you and that girl. I can understand this, but it seems pretty hypocritical. Since she has more relation with this guy, then I ever did with my buddy. 

NOTE: I tried to make it as short as possible, if you need anymore info I will be happy to post it, just did not want a

Can you provide a brief overview of the text?
<bot>: NOTE 2: I just want to thank everyone for the comments and advice, has really given me a lot to think about. This is obviously a throwaway, but I may post a follow up just to vent.