It is much harder to backup, but it can be done
"look I really like hanging out with you but this is getting serious and I'm not sure I'm ready.. I just got out of my relationship bla bla bla. I still want to see you but I'm really just in date mode right now"
And linking, I tell every one of them yes, I am dating other girls
But I do my best to avoid bringing 2 girls I'm dating together. Believe it or not that is NOT the best way to get a 3some, lol
Girls will still get jealous. You have the discussion to be up front, then leave it alone entirely. Don't talk any more about other girls or let her see you making out
Seriously read the link above, MLTRs are one of the strongest pieces in my game