I've been meaning to call you.
→ 전화하려고 마음먹고 있었어.

[예문]

A: Kevin, I've been trying to reach you all week. Where have you been?
A: Kevin, 너한테 이번 주 내내 전화했었는데. 어디 있었던 거야?

B: Oh, I'm sorry. I've been meaning to call you, but I was too busy.
B: 아, 미안. 전화하려고 마음먹고 있었는데 너무 바빳어.

A: You just work too hard, my friend.
A: 친구야, 너 너무 무리하는거 아니야?

B: No, I don't. It was just a hectic week, that's all.
B: 아니야. 그냥 좀 바쁜 주였어, 그게 다야.