What do I do if he comes back?

So My ex (V) and I broke up last summer since he needed time to think and he said he'd be back then blocked me on everything. He had started ditching me to hang out with his girl best friend who was going through some stuff right before. Now I have a new relationship with a guy who is a year younger than me (I). I had loved V so much and it took a while for me to get over him but now I'm with I but I've been worrying about V coming back since I don't think I'm completely over him which confused me since I'm in love again with I. What do I do if I'm not completely over V when/if he comes back?
What do I do if he comes back?
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