Feeling guilty about attraction to a younger man?

This guy is 10 years younger than me (32 vs 42). We used to work together five years ago. He started flirting with me, rubbing against me, touching my arm etc. I've been told I look a younger than I am. He knew my age and that I was married. It was a nice compliment after years of living with a cheating husband. The flirtation never went past that, except meeting once at a dance club and phone . Now, my husband and I are separated and getting a divorce. Meanwhile my friend has moved to another state. He was in town recently and he came over after several days of phone flirtations. We ended up in bed together. He said he would make love to me but it didn't happen. I satisfied him orally, then he got dressed. He said he wanted to get to know me better before having w/me. Then he wanted to talk about STDs. I can't help feeling used. Do you think he thinks of me as a ? I want a relationship w/him but I feel guilty for having feelings for him and wanting more. I want to be happy