Itβs not love ,just attraction towards something you canβt have.
This is why fwb is something we should always avoid,one will start having feelings for other and ended up suffering cuz of it. There is still time,have a proper relationship with someone else.
Itβs okay if u wanna meet him. Tell him what you had was beautiful, but you have to move on.find someone that truly appreciate you,a loving relationship like you with your gf.You donβt wanna be an unnecessary part of his life.