I think I’m in love with my ex-husband’s mistress. We were married for three years when I learned he was cheating on me because his mistress, “Kate,” sent me proof. They’d been seeing each other for six months after meeting on Tinder. She’d had no idea that he was married. It wasn’t some big heartbreak, as our marriage had been rocky from the start, and this was the last straw. Kate and I ended up meeting for coffee and got along like a house on fire. We both work with children and love dogs and hiking. We ended up going on a hike together the very next week. That was two years ago, and I haven’t seen my ex-husband since, but Kate and I still go hiking once a week. Now these hikes are socially distanced. They also seem to have gone from “friendly” to “flirty.” I’m very attracted to her. She’s mentioned having had girlfriends in the past, and I’m bisexual myself, although I’ve only dated another woman once before. I’m starting to fall for her, and sometimes she makes comments that suggest she may feel the same way. But I can’t help but feel a little awkward about dating my ex-husband’s ex-lover. I’d like to try to ask her out, but I’m too nervous. What should I do?