Why do I feel like I'm being unfaithful even though we're not in a relationship?

Met guy A and we've been talking for six months now, started talking to guy B a month before our (my date with guy A) first date (took us months before our 1st date). I felt like I was being a bore to guy A and thought 'what if he doesn't like me after seeing me in real life' and THANKFULLY ✨ he did. Guy B feels like the kind of guy who'll just leave you stranded in the middle of nowhere, and I don't wanna be put in the same light he sees all women. Me and guy A aren't in a relationship yet, we just going out on dates and getting through all the four seasons first, we've been through three already and I feel like I'm getting to know him more as we go through these seasons. How do I tell guy B I'm not interested without hurting his feelings? Thank you.

Why do I feel like I'm being unfaithful even though we're not in a relationship?
Post Opinion