Need an opinion!

Ronald

I've been with my lady 7 months on Friday I love her with all my heart she loves me with all her heart we used to live together for 4 months then all of a sudden her father and her brother comes and tells me I have to leave so we still stay together from Sunday to Wednesdays but things just started changing we just lost our baby on January 1st this year and my lady is 34 years old never been pregnant before but now she's doing a lot of shady things I do everything for her cook clean i buy whatever she want, give her money everything and she does the same for me she goes in my phone anytime she wants has my passwords to every app you can think of but I checked her phone twice and each time I saw a text from her best friend said we need to have another session and she said yes we do so I asked her when it mean she said a weed session I like you only smoke weed with me twice then she took a dude's number from her job the same day and he asking her for her Facebook name so now today Sunday and she's telling me she is going spend time with her mother and when her mother dont like her being on the phone in front of her. now my mother told me don't go looking for something cuz you going to find it I just passed by the house and I'm scared to go up there cuz I might find a dude and then go crazy so am I wrong for thinking that she's cheating cuz she's truly is a beautiful person and I don't believe she would do that but I don't want to be stupid I just need some opinions cuz I'm a good man to her I just need to understand if I'm feeling wrong