Searching badly

It’s a manga yaoi. Fucked up.

The student is walking home from school, MC, I believe. And he sees a lonely teacher on the side, sitting down and it’s getting late.

The teacher and MC have a thing and start to be sexual with each other. They have sex. MC visits the teacher daily until one day the teacher tells him to not visit, because he will be busy with exam prep and work.

I remember the teacher saying to not visit for at least 2 weeks. The MC reluctantly agrees. He leaves and then comes back two weeks later, he knocks. He finds out the teacher doesn’t live there anymore, and he tries to call I think(?).

When he can’t get a hold of the teacher, MC is devastated and heartbroken. He found out the teacher tricked him and left him. The teacher didn’t seriously love him, just used him to fill his own loneliness temporarily.

And the cycle continues. MC becomes a teacher years later, he finds a student and takes him home, being affectionate and sweet. But we don’t know the ending, not sure if the MC will do the same thing his previous teacher did. Open ended. Perhaps he will change the ending.