<human>: Can you give me a shortened version of the text?

Here's a little context to our relationship:
We started dating about 5 months ago, everything seems great, there are a little problems, mainly that we don't get to enjoy each other as often as we'd like, and he does complain about it frequently.

My main reason for concern is the following:

About two days ago my boyfriend and I were getting ready to go out from my apartment, he was packing up some of his clothes seeing as we didn't plan on returning that very night. Everything seemed fine, we had a great day full of wonderful sex and had a lot of fun together. But as I walk in to the room he hands me a clearly used condom and asks me to dispose of it. Of course, like anyone would be, I'm startled and speechless. He gives me this weird, sort of half-assed smile (the one he usually gives me when he's lying) and asks "What?". We hadn't used a condom in a while (I'm on birth control), so I'm clearly upset. He tells me it was a practical joke that he wanted to play on his best friend, and that he filled it up with hand lotion... and salt. I know at this point he's clearly lying and trying to cover something up. Then a couple minutes later when I tell him that there's a clear reason for why I'm upset, as anyone would be. He then tells me that he had jacked off in it and that if he was cheating on me why would he give me the used condom. His argument made sense, but then again I was wondering if he gave it to me because he was worried I'd find it or something along those lines. 

I'm scared to talk to him about it and at this point I have no idea what to do. Could he be lying or am I actually just overreacting to the whole situation.
<bot>: Boyfriend hands me a used condom and tells me he jacked off in it and wants me to dispose of it.