My boyfriend got “ horny” right after i had a mental breakdown

Me and my boyfriend are long distance. Despite this we love each other very much. He’s very patient with me and treats me very good. There’s one thing that confuses me. Most of the time when i cry or have a breakdown on the phone about anything really, he supports me as he can and he helps me feel better. The thing is, there have been a few times that he seemed to have gotten horny after im done ranting and crying. There was a time i was crying really hard about something (i dont remember what) and i was sad, and he asked me if i wanted to masturbate (im guessing on the phone with him). he said it in a funny voice but i was confused on why he would say something sexual during one of my breakdowns. he apologised. now 2 days ago i was feeling suicidal and i was talking about this to him while sobbing and he comforted me like usually, but then right after i stopped crying he mentioned how he is horny. why would he be horny right after he sees his girlfriend cry about how suicidal she is? is this a red flag? he apologised and told me that he wasnt actually horny and that he just got a “boner bc he was playing with his balls” am i overthinking this? i don’t want to date a guy who gets turned on by my pain and distress. most of the time he comforts me and helps me a lot and doesnt mention anything sexual, but there have been a few times he seemed horny afterwards. what do you guys think?