<human>: Give me a shortened version of the text

My boyfriend and I have been together for four months. He used to own a cat, but it died a few months before we started dating and he felt so bad about it. He has an acquaintance who lives a block away from his house who had a cat and who leaves the cat with him when she is out working. My boyfriend Loves the cat as he missed his old pet. I have met this friend and the cat and I do not put malice to their friendship since the cat helps boyfriend recover. One night, he got drunk and started saying weird stuff and he said he would jerk off to this neighbor and to this cat. He said he was just kidding the next day. However, lately, this friend wants to sort of have a joint custody with this cat with him. When I asked him why she wanted to, he said he didn't know. She always lends him the cat and lets him take care of it even if she has a roommate who can probably look after it when she is gone. There was also one time we were going to a party and he wanted to invite her and her "boy toy" although she was not home that night. I don't want to play naive or be paranoid but I also can't help but think if there is something going on between them. Should I ask my boyfriend about this? I'm not gonna start s fight with him but rather talk to him about this in a civil way. Would I come off as accusing and a crazy gf?
<bot>: boyfriend getting close with friend who wants to share her pet cat with him. Should I talk to him about this, and how do I do so in a non accusing way?