Update: I did talk to him about it and he said he used it to masturbate. I asked why he would do that if guys hate condoms. He said it just feels different and gives him a different grip and only does that very rarely like twice a year or something like that. I chose to believe him because of everything else in our relationship being good and both of us showing love, respect and care for each other, but it is still a hard pill to swallow and deep down I'll always wonder if that was tru, I feel.

I''ve been with my current BF for 2 months and 2 weeks ago he had 3 condoms and today I found only 2. I was not staying with him all the nights during the past 2 weeks because I was watching a house in another neighborhood. 2 out of the three condoms were one type and have not expired and he still has them, and the other condom that is now missing was a different color I think but same brand, and I didn't get a chance to look at the expiration date on that one, so I cannot be certain it was or wasn't expired if he uses that justification but also, I find it hard to believe he had an expired condom there, I mean those things last years and guys don't let them go unused that long.

TL;DR; : I am confused, sad, freaked out and trying to make sense of this but I cannot make any other explanation in my mind on why that condom is missing other than he used it with someone. Why else would that condom be gone?