I thought it was a rebound but they have been together for a month… Yesterday he changed his profile pic to a pic of the two of them… I’m completely Devestated… Aside from not thinking he could be so cruel and heartless I just can’t believe he is doing all of this in front of the whole world… I guess he really has moved on… 
Did you read the following article: https://exbackpermanently.com/is-your-ex-in-a-rebound-relationship/
It says “A very common sign of a rebound relationship is whether or not they are trying to rub in your face. If your ex is going out of their way to show you they are happy in their relationship and everything’s going great, then it’s probably a rebound and they are not doing that great in reality. One of the most common indicators of this behavior is their social media profile (Facebook, twitter etc.). Your ex knows that you are checking their Facebook and if they are constantly posting picture with their rebound then it’s a sign that they are in a rebound.”
Rebounds can last for months. Hang in there
I thought my ex was in a rebound turns out I think he has actually feelings for this person…Their both emotional involve with eachother so I guess to them that means their in love…he don’t go out his way to let me know his in a relationship I just had to find out on my own and he said he didn’t want to tell me because he didn’t want me to hurt…So I feel like he’s not contacting me because he’s truly involved with this girl and he don’t want me to hurt everytime we talk …that’s why I’m moving on but today I broke down…I thought I could handle it but I guess because he was like my realest relationship I had…but yeah hopefully the storm will past…