It doesn’t seem from what you write that this is a relationship worth pursuing. If you don’t have time together, the sex is bad and he’s still seeing his ex-girlfriend, what is it that’s making you stick around?
If you both can’t make the relationship a priority, then there’s no reason to stay in it. The fighting, the bad sex, the friends always in the house on weekends to keep the two of you from being intimate and his ex-girlfriend, all have to be attended to if you’re going to stay in this. Frankly, it sounds like a tall order — but that’s your call. From where I sit, I’d advise you to move on.
I hope that helps.
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