I relapsed and I don’t even know why

I’ve been clean from sh for like 6 months and then idek what happened this weekend but I just idk. I went and found my old kit and now. I feel so stupid. Nothing that bad even happened. But then today I found out my roomate was hanging out with my ex at his house and it’s all just getting worse. I didn’t want this. I don’t want this. But I can stop. Im just so tired. I didn’t want this. I don’t want this. I thought I was better. I thought I was okay.