Since coming out to family I can't stop wondering if their support is just an act?

This might sound strange but I just came out to my brother a few days ago and it started off really well, very supportive. Next day we are coming home from a trip and get into a bit of an argument over trying to get a ride when he just storms off. Called me up saying I was no longer his brother, and that I was a pathetic piece of shit and to enjoy sucking dick, faggot. It hit me real hard but I wasn't even crying, I just honestly felt done with life. He apologized later and continues to be supportive. But now a part of my mind keeps hinting at the thought of his support all being an act? And maybe the same with my dad? Idk i was feeling really good until i got that phone call. I know ppl need time to process the whole coming out thing but damn... I just don't know how to feel about this anymore. I feel so weird about this all now that its actually dampened my sex drive entirely. Im so stuck inbetween being homophobic and not being homophobic that I just kinda completely disengaged from even thinking about touching another man. I can't believe how messed up i am right now. Even after talking with some ppl on Reddit my mind still keeps jumping back into that dark place.Any thoughts on this?