I'm married ex & have a boyfriend

I'm married with my ex I have a boy with him I still love him. But in the other side I have a boyfriend he really nice and carries if is love no is more to forget my ex I know is bad but I know I could far in love with him I don't want to regrets anything with this guy, I think course I been with my ex 11year married and I was waiting for my ex for 5year so I need to move forward for me and for my son but I don't want my ex tell me he want to be with me and then I hurt my boyfriend felling I don't want that I never want it to be in this dumb thing but I need to have my normal life he want me to take my son to his family I know my heart and I feel like family is back then I go home and feel sad course I miss them ,,,,,what to do.