my fiancé has an apparent crush on my sister
I (21f) have been together with my now fiance (26m) for 3 years. We recently got engaged and the engagement party completely ruined my life.
I basically noticed him ogling my sister (24f) the entire engagement party. To be fair my sister is extremely beautiful and charming but ffs I am literally his fiancée and he barely glanced at me all night! He's had problems in the past where he would openly check out other girls but I thought we had worked it out.
I was feeling confused and heartbroken and I asked my mother about it but she just told me I am being paranoid.
The other day when we were out and he went to order our food I looked through his phone and discovered he had sent messages to my sister complimenting her and calling her beautiful. She saw them and didn't reply but she also didn't tell me.
What should I do? I have been crying myself to sleep for days and feel so conflicted and disgusted. How am I supposed to marry a man who can't even keep his eyes away from my own sister?
I have already decided that I am going to break up with him but I don't know how I am going to trust someone again. To me it seems like all men are lustful and have wandering eyes and I am losing hope on finding someone who is completely loyal.
How should I confront him and my sister who this away from me? And how can I get over this because it has really affected my self-esteem.