Why did he stop mid sex?

Anonymous
I’ve been seeing a guy for about 6 months. The sex in the beginning was incredible and often. Couldn’t keep our hands off each other. Recently though he’s seemed less interested when I send sexual texts and the last few times we had sex, he’d lose his erection and stop mid sex. One time he knocked over his phone loudly while we were in his parents basement. The other two times he said he had a headache. I feel like he’s losing interest in me or attraction to me. Last night was the first time we stayed together and he didn’t want sex at all or this morning. Everything was fine up until a month ago, what’s happened?
Why did he stop mid sex?
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