Will try to keep this brief.
Colleague (same level as I) was dissatisfied with my working style and quality of output on a recent joint project. Never clear exactly what was wrong, but made very evident. Made for a very uncomfortable working environment but tried my best to keep the peace and do my best. Kept my conduct professional etc. Never once did colleague try to actually speak with me to resolve the situation. I did request meetings etc but always told colleague was 'too busy'.
Colleague then seemed to lose it- excluded me from communications, had meetings without inviting me and basically removed me from the project. Was very obvious to the rest of the team so all rather humiliating.
No strong proof, but fairly certain said colleague has also spoken about me (my supposed 'incompetence') to our peers as well as those senior and junior to us, so feel like my reputation is tarnished. I am relatively new, while colleague has been with company for a few years if relevant. Feeling very humiliated to the point where it's affecting my MH.
I am seriously considering lodging a formal complaint regarding colleague's conduct. Do these sound like reasonable grounds? HR seem to be trying to steer me away from doing so but in all honesty I am furious and don't think anyone should be able to get away with this.
Thoughts? Please be kind.