He moved on after a week 🙃

My ex and I were together for a year and a half and about 1 week ago we “broke up”. Usually we would be off and on and would always end up getting back together after a little break so that’s what I expected this time. But I looked at his Instagram and he started following girls who also followed him back so I’m assuming he’s dming them. Like literally 5 days after breaking up. Anyone else ever have this happen? It feels like shit because he would always say he only wants me and I’m the most beautiful girl in his eyes. How does that change in 5 days? I really just want to give up on men and relationships in general. But at the same time I just want to have a hoe phase and just fuck whoever I want to because I feel like I deserve it.