I don't belive him when he says I love you?

We've known each other for 9 months and been dating for 3. Unfortunately, I don't believe him when he says he loves me and I'm the only woman most important to him. he often talks about his former partners. one in particular, he was in love with for 10 years and they were together for 4 years, but she treated him more as a friend because they had never slept together. I think he still has feelings for her and if she gave him a chance he would come back to her. Does it make sense to continue and live with the thought of a possible breakup?

I don't belive him when he says I love you?
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