He keeps talking about his ex girlfriend but has sex with me?

Me and a guy have been like best friends for 2 years and now that he came visit me in my city we ve been togheter everyday for the last month and we had sex many times.
He's very respectful and he truly cares about me, but sometimes he starts saying he misses his ex girlfriend and seems a bit distant..
What should i think about it?
He keeps talking about his ex girlfriend but has sex with me?
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