Love vs lust?

I've been with my SO for a year. We'll call him Bob. He's not been very interested in me lately & we don't really have intimate moments anymore. So one night Dan started flirting with me and made me feel really good & now he wants to date me. I want to make it clear that I'm so in love with my SO but he's not making me feel good. Should I go for Dan? Just to feel something? Tell me who to pick. 

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