Stoners are not always reliable people.
Depending on the reason for their self medication, they are not always nice to be around, or safe, or able to relate to other people's reality.
Depending on the type of weed they use, they can become spacey, paranoid, aggressive, depressed, anxious, even psychotic. Long term use can contribute to cognitive decline, addiction, lung problems, including cancer, other cancers including cancers of the head, mouth, throat, and testicular cancer, and problems holding down a job.
Nowadays, the THC content of marijuana is about 15%, where it used to be about 4% back in the days of the hippies. The side effects are more likely, and more likely to hit harder.
I doubt this is the only nice, sexy guy on the planet - what is it about him in particular that attracts you?
Are you deliberately looking for someone to 'fix', or someone fundamentally unavailable to you?
Did you do any therapy after your previous relationship?
I recommend a book called "Co-Dependent No More" by Melody Beattie.