He is not my boyfriend

So me and this guy has been talking and intercourse for the past six month.. after that much time I find out he been talking to other girls but he claims that he love me and that he is sorry for what he did however we were never in a relationship I have try to cut him off because I feel I been cheating on but he always come backs to me.. do you guys think I should contact the other girl ???? and let her know he still looks for me or I should just block him and move on. I love him so doing that would kill my feelings. Please help me.

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