Is it normal for my boyfriend to fantasize sleeping with other women?

Me and my boyfriend, now ex, were together for 13 months. Our relationship was on and off. 3 days ago we had a massive argument because he called me up in the morning and started interrogating me about who i was talking to lastnight, where i was blah blah. i got really upset becuase he knows i dont do anything,... show more Me and my boyfriend, now ex, were together for 13 months. Our relationship was on and off.
3 days ago we had a massive argument because he called me up in the morning and started interrogating me about who i was talking to lastnight, where i was blah blah. i got really upset becuase he knows i dont do anything, hes paranoia kicked in as he smoked weed that night with his mates. Also i have to go to court on monday and i had to see my lawyer a couple of days ago. i asked him to come and see the lawyer with me for support and he refused. I asked him about 5 times and he refused, do i have a right to be upset?...Well i was...
As the day passed, i was verbally abusing him through text really harshly because i was just really upset about what he did. he then called and said im breaking up with you because im mentally sick, i need to go to rehab, i need my own space and because he fantasizes about ******* other woman while with me. he said im not normal (as in him).

what the **** and i tried to sort things out with him but no response.
is it normal for a guy to do this while in a relationship?
Could there be something else behind it not just the women?
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