What should I do about her?

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I dated this guy for a little but nothing overly serious. He was rather on the shy side, very nice guy, but he just didn't seem to want to move anything along (not like I was in a hurry either). I gave him least 7 or 8 months. I decided to do things for myself this summer as most times I am petsitting, working, and hanging with friends. I made a list of things to do and that was my goal. If he wanted to spend time with me then so be it. He would show up places, and even if he was with other people he was always staring at me. If we talked or I tried to ignite something again he would just be ackward and figetty. His ex who I had no idea who she was, nor do I care. Made a comment to a few people I knew, so I ignored it. She kept doing it, so I told him. Now for me my ex started saying things about this guy because obviously he still wants to be with me. I shut him down even before the guy knew about it. I told him this girl (and I never once said it was ex) used her name stating this chick and what she said about me. Well he then just went cold, so to me I automatically assume your probably sleeping with the girl or something. So I went on my little merry way, he would show up again, and try to talk to me. But then would disappear finally I said to myself I am just doing my thing. I saw him over the months, but he would never talk to me. Well back around Thanksgiving I get a text from my friend about how he asked about me, and asked his ex what she said or did. Well of course she denied it, then blocked/ deleted him off Facebook. Now I don't need or want to drama but I can still see us dating if he gets over this really. So I tried talking with him, he blocked/ deleted me so I said whatever thats it. I just wanted tosee what his ex would say to me, so I nicely met up with her. She sat telling me he is a negative guy, and immature (coming from a girl who is 23 2 kids - by different men, dating another guy, keeping track of her ex, bipolar statuses on fb, and then barely holds a job) that he deserves tobe happy and of course she did it all. Well I went to the grocery store and her now boyfriend was making ignorent rude comments and saying how nice my rear is (and he doesn't know me). But judging by that behaviour is a real keeper. She strolls in with a pile of her friends, and her boyfriend. She sits staring me down, and her friends. I just ignored her, I was like wow how can this girl be so immature and stupid. My friend told me I should bring this up to the guy. Well if he is listening to her then I should have my answer. He simple ignoring me and not wanting to listen to it.