What should I do with my guy friend?

Is it safe to assume that my guy friend is sexually attracted to me? We're both in our mid 20s. He's already married but we have a casual friendship with no malicious intentions of cheating or whatever. We train in the same gym and I've never worn anything that would make anyone feel uncomfortable. He and I talk casually and freely about random things when we're both in the gym but in many of those conversations, I've caught him glancing many times at my breast and the rest of my body. Like I said, I wear loose comfortable gym clothes so I'm sure my choice of clothing are not calling for extra attention. He has never suggested to do anything sexual though so I don't worry too much about it. I just want to know. What do these glances mean? I enjoy his company but should I keep my distance?
What should I do with my guy friend?
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