So confused with my life?!

Ok so I've in a no off relationship for the last 9 years with my boyfriend we 1 adorable little girl together we have discussed having another child , witch I would love . My problem is I don't think I love my boyfriend any more we argue like cat and dog about the past (sleeping with other people when we weren't together ) he's a stoner , I've just got a new job that I love I've met new kind of people and I'm starting to question my own relationship every day I'm at the point were I fantasise splitting up daily and how good my life would be without him but I feel extremely selfish on my daughter , I just feel like I'm in a dead end with him he has already said if he couldn't have me know one could and that he would find ways to hurt me if we split up but he does love me when we're together ... any help ?

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