Need advice on what to do with my partner?

Hey I have been with my partner half a year now , I just recently received a message from an old school friend that also knows my partner saying is this your boyfriend Instagram I said yes she than shown me messages and screen recordings of him liking and commenting on another girls posts from September/October time all the images are revealing and none of her in clothes. He emitted he was in the wrong and none stop messaging me saying how sorry etc he is but this don’t help as I have bpd and it triggered my mental health loads as I’m not skinny and it made me so low in myself. I’m looking on some advice on what to do I do love this lad loads I spent over £400 on him for Christmas.
Need advice on what to do with my partner?
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