ladies I need advice....

last October I found my dad cheating on my mom with my tia (she's a family friend but I'm Mexican everyone is a tia or tio) anyways I called them out, they said they would squash it. I didn't tell my mom to avoid her getting sick (she has a history of strokes) ....my dad decided to split ways with my mom in November.... I've still had that gut feeling that there is still something with my dad and tia....my tia started distancing herself from me and my mom... my dad isn't as talkative anymore.... and today I got news that someone had seen them together.... a few hours ago my tia told a mutual friend of ours that she was going to the casino.... and my dad usually goes to the casino on Wed evenings..... I might be going crazy because I'm prego but really the signs are there.... my dad gets mad when I confront him and my tia doesn't even answer my calls....

I'm stressing guys!!!! and I feel like I bug my husband and bff too much about the situation so I come to you! what should I do!?!?!?