Why is she making excuses to not have sex?

I was on this site with the same issue about 6 months ago. My girlfriend stopped having sex when we used to have a good sex life. At the time, her reason was that she’s on antidepressants and it kills her libido. I stayed by her side trying to be a good supportive boyfriend. But now her excuses are getting more and more pathetic.

Today she told me come over and we’ll have good sex. I went over and we did a lot. We went shopping, made dinner, worked out, and showered together. When it came time for sex she said the house is too cold to have sex. So I turned up the heat and we watched tv while waiting on the house to warm up. She fell asleep on the couch now saying she’s “too tired”. I’m really to cheat. Should I just drop this girl?

I don’t feel like a have a girlfriend. Feels like I’m hanging out with my sister.
Why is she making excuses to not have sex?
I’m right to leave her
I’m wrong to leave her
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Why is she making excuses to not have sex?
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