I don't know with what intention he approached me, but it certainly wasn't a good one.
I don't know his intention in approaching me, but.....
Thanks.
Both seem OK, but I'm not an expert. Were it mine to write, I would match the tense of his intention with the tense of your evaluation, and trim the end: I don't know what his intention was in approaching me, but it certainly wasn't good.
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Both seem OK, but I'm not an expert. Were it mine to write, I would match the tense of his intention with the tense of your evaluation, and trim the end:
I don't know what his intention was in approaching me, but it certainly wasn't good.