That enough alone is enough to dump his sorry ass. Dont entertain anyone who thinks its his business to comment on your body (weight, height, anything... its a recipe for disaster).
There are several reasons he would comment on your potential weight, and neither of them are good.
He's either doing it to make you paranoid, self conscious, no one else will love you tyoe shit...
Google says it better than me.
Insecurities and Relationship Dynamics:
Insecurity about one's own body:
Sometimes, a partner's concern about their significant other's weight can stem from their own insecurities about their body image or aging process.
Comparison and competition:
In some cases, a partner might compare their significant other's weight to others or even feel threatened by the possibility of their partner becoming more desirable to others.
Relationship issues:
Weight gain or a lack thereof can sometimes be a symptom of deeper issues within the relationship, such as a lack of communication, intimacy, or emotional connection.
Abusive Behavior:
Controlling behavior:
In some situations, expressing concerns about weight can be a form of control or manipulation, especially if the partner is dismissive of their significant other's feelings.
Verbal abuse:
Some individuals may use weight as a weapon, resorting to insults or derogatory comments about their partner's appearance.