Was suspicious of something (?)

Спасибо!

— I didn’t know Nicky was standing behind me and I mentioned your party this weekend. Now he wants to come.
— Ugh, that’s what I was afraid of. Oh well, I can’t NOT let him come.

(Is this what you mean)?

Sometimes it’s clearer if you post a little dialogue.

Спасибо, я это учту!
Как, кстати, сказать - я это учту?

I'll keep it in mind.

I’ll keep THAT in mind 😉

Ага)