He lied

TL;DR I (24F) is in a relationship with my boyfriend (25M) for 2 years and 7 months. Throughout our relationship I've always asked him to be honest about his past relationships and whenever I do, his always respond is that those relationships don't matter. Yes, I do agree on that. That's why whenever he said those relationships don't matter, I don't push for any more conversation about it. However, last August, I found out that he searched his ex's Facebook profile. When I asked about it he said that he is only curious if his ex blocked him after their conversation. When I looked at their convo in messenger I found out that he deleted all their messages. In that moment I lost my trust in him. Why delete conversation with your ex fling? Is he hiding something from me? Those were the thoughts running in my head. Later on, he asked his ex fling to send screenshots of their last conversation. There I saw that they had this conversation on March (When we were 1 year and 11 months already). I read him saying how she still moves his feelings/emotions when he sees her accidentally or whenever his friends talked about them. He also added that if only the ex expressed how she felt for him upfront, everything would have worked but he admits also that he have faults. He also mentioned how hard it was for him to move on and how much he regretted how they ended.At the end of the message he said how important I was to him now and how he values my peace of mind (contrary to what's happening now because of this message). I confronted him lot of times, asked for clarifications and yes most of the times he would answer me. You may ask why it's important to me when it's his past. I think it's unfair for me not to receive his 100% love starting from the beginning. I don't think I deserve to be just a rebound. No one deserves this. Later on I tried to trust him again, move on from it.

Ff to this week, I just met his friends and there they kept asking when did we both started dating and kept mentioning the girl. To me it was painful but still I answered all their questions calmly as possible although I can feel that one of his friend is somehow hating me or the relationship because of how he reacts and how he acts. Today, I found out that just a day before we first meet up (which is also that day we considered as our anniversary day because we clicked instantly and we've been friends/ mutual understanding on and off for almost 7 years) , he chatted his friends how heartbroken he is because of the same girl.

Now I'm not sure if this relationship is real or I'm just the girl he used to move on from his ex fling. Please send give me real advices. Thank you.