When a man is in love, does he forget about all his problems ( including those pertaining to separate relationships) ?

I’m having relationship problems with a guy that fell for someone else whilst we were talking. There was a keen interest involved. I told him it had affected my mental health but he didn’t respond and now ignores my feelings to be with her.

Is this acceptable behavior?
When a man is in love, does he forget about all his problems ( including those pertaining to separate relationships) ?
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