How do I know if a guy is just using me for sex?

Hello everybody. Recently, one of my male friends I’ve had a crush on for a while told me he likes me. I’m not at a good point in my life for a relationship so I told him I need time and he said to take all the time I need. But we did get physical (no sex and it was consensual) that same day. He keeps inviting me to his house which scares me but he also shows interest in me by visiting me, walking with me to my home, holding my things for me, and more gentlemanly stuff. He even offered to help out with my birthday party and pay for my food. He is respectful and always asks if I’m comfortable when he touches me. But still, the inviting over and the physical touch make me feel like he’s just planning on using me for sex. What are some signs a guy is using you for sex? I don’t want to be disappointed by not realizing the signs.

How do I know if a guy is just using me for sex?
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