Please help is my boyfriend calling me nick name after his ex am I just paranoid help?

I have a boyfriend currently me and him have been with each other for 3 months. The first 3 initials of my middle name is ale ( don’t wanna give out the full sorry) he then told me he wants to give me a nick name that matches with that which will be ally he told me he wanted it to me unique I didn’t think much of it so I went through out my day. Anyways to make the long story short I found out his exs name was “Alyssa” and she called herself ally? I was shocked at this and I don’t know what to do I don’t know if it would be a coincidence because he told me he loves me and that I should trust him I haven’t told him about this yet. I even told him one time if he could change his initial in his bio which is the name name he gave me to my real name which is Cora. He then said no and said he prefers the nick name he gave me? Am i just paranoid I don’t know what to do.

Please help is my boyfriend calling me nick name after his ex am I just paranoid help?
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