Why is it so hard to talk to an ex-boyfriend or ex-girlfriend?

Well, you know it that you're not connected to them as much and that it didn't work out. Also you're afraid that they might not like you.

Because you don't want to be reminded to the relationship you had. To the breakup you had. You don't want to remember the promises you made each other, because you didn't/couldn't keep them. It takes really very much to talk to your ex, be it boy or girlfriend, and truly forgive the person.

Because you may still have some deeper feelings for them that extend beyond friendship. And its hard to see them with someone else and be happy for them when you have been in a relationship

Because they were once an part of your life but are usually no longer in it. As an ex, it usually means there was some pain or hurt during the break-up. There may be pieces of yourself that have changed because of going through this event and talking to an ex may make you think about these changes, whether they be good or bad, and that can make talking to them difficult. Usually people like to avoid people who they associate with causing them some pain, which is a usual thing to happen in a break up and might be why you find it so hard to talk to them.

I think that talking to an ex-boyfriend and/or ex-girlfriend is hard because of course it's going to be pretty awkward depending on where you two left things. It would be kind of difficult because there maybe some feelings still there on both ends or just on that one person.

because you guys share personal stuff and things you thought and never would.you may have broken up but the feelings and memory you guys share together will always be there no matter what

Its hard to talk to an ex because by talking to them it resurfaces all of the amazing memories you two once shared. Letting that part of you go was hard enough, trying to talk to the person after u finally let it go, kills you inside.

its normal all the memories and good times pop up and with it comes the sorrow of the breakup as well

Its just awkward, you once were so much, so together , so close and now you are completely apart, it can just be very confronting

It could be hard to communicate with an ex if the relationship ended badly. Sometimes it is hard to get over old feelings.