I have an ex-husband and an ex-FWB. The ex-FWB ended it himself in a cowardly manner (not telling me with avoidance), and I ended a bad marriage with my ex-husband. Although I still have my ex-husband's contact information for when I can finally get our stuff out of storage and he can get his crap. The ex-FWB is still on my FB flist (he neglected to defriend me for some reason), but he hardly updates unless his girlfriend of the month posts pics of her and him together.
I've been in the same relationship since I was 17 (in 1997), so there's not a whole lot of exes to be worried about. I just kind of grew apart from most of the people I dated in high school. There is one girl I dated (who also dated my husband at one point) that things ended badly with, and I certainly stopped all contact with her on purpose. My first boyfriend, who I dated when I was 14/15, died in a car accident a few years ago. We did stay in occasional contact with each other before he died.
I think if anything, he appreciates it because it's making things better in our relationship It's more of my ex telling me what went wrong in our relationship and how he thinks it could have been better, but also him learning from his mistakes in previous relationships
I have a mix of we now hate eachother and avoid at all costs, but one of my best friends is my ex and we dated for a year. I've also had a room mate that was an ex first. It all just depends on how it ended and why.
My most recent ex, no, he's not welcome anywhere near me and I've made it clear that contact is not ok. My first boyfriend though, I still hang out with, he gets along with all of my friends (including my current partner) but he's a silly guy, he never really grew up.
I was close to 3 of my exes but now I don't really talk to any of them which is fine by me. I also have the exes who leave me or cheat on me to realize the one they left me for wasn't better then me so they come back apologizing an trying to beg me back.
My most recent ex, (it's been almost 5 years) thinks we're still going to get back together, so I avoid him. I tried being his friend, but I don't want back into that relationship because one he was horrible, and two I'm inlove with my current boyfriend. I've had to block him on every social networking site and change my number because he was constantly hitting me up and stalking me at work. :/