I love you

My bf is a libra and I am an aries. We have been together for about 2 months now. He tells me that he loves me alot and would do anything for me but recently I have been feeling insecure because he added his ex who lives in another country and is also an aries. He is going to that country for a week to visit his friends and family (or thats what he told me)

He tried to hide this from me, when I confronted him about it he says that they dated when he was very young,and that she is his first love, but I should not worry about it because now he only loves me and would not cheat on me.

I dont know if I should believe him so dear fellow libras, when you are in a relationship with someone you are happy with do you guys cheat?

He is so affectionate, caring, loving, and tells me he loves me but then he tries to hide his fb from me. I dont get it.

He has his sun and moon in libra

Do you guys say "i love you" to someone you really love or just to someone who expects you to say it?